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  • 1.
    Arvidsson, Anna K
    et al.
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Lundberg, Thomas
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Kalman, Björn
    Swedish National Road and Transport Research Institute, Infrastructure, Pavement Technology.
    Ekström, Camilla
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Cruz del Aguila, Fernando
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Eriksson, Olle
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Friktions- och texturutveckling på nya beläggningar2019Report (Other academic)
    Abstract [en]

    A new pavement should be and be perceived as safe by road users, regardless of the road condition. It is therefore important that the road has a satisfactory level of friction already when the road is opened. There is limited documented knowledge of how the road change in the beginning after a paving performance.

    The purpose of this project is to determine how friction changes during the first period after road pavement is laid and traffic is permitted. The ambition is to determine if new road sections have reduced friction and provide recommendations for when a friction measurement is to be performed, and how warning signs should be displayed in connection with the pavement work. The study plan has been to follow different objects with frequent friction and texture measurements from just before the stretch is opened for traffic until the levels have stabilised.

    Initially, friction is high, and then decreases with the amount of traffic. After 1-3 weeks the lowest value was reached and then the friction increased or stabilized. Common to all investigated stretches, there are major changes in texture levels from the first vehicle and then a decreasing textural level until a stable level is reached after 1-3 weeks.

  • 2.
    Carlsson, Anna
    et al.
    Chalmers University of Technology.
    Chang, Fred
    CAE Department, Humanetics Innovative Solutions.
    Lemmen, Paul
    European Engineering group, Humanetics.
    Kullgren, Anders
    Chalmers University of Technology.
    Schmitt, Kai Uwe
    Swiss Federal Institute of Technology.
    Linder, Astrid
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Svensson, Mats Y.
    Chalmers University of Technology.
    EvaRID: A 50th percentile female rear impact finite element dummy model2012In: 2012 IRCOBI Conference Proceedings - International Research Council on the Biomechanics of Injury, 2012, p. 249-262Conference paper (Refereed)
    Abstract [en]

    Neck injury due to low severity vehicle crashes is of worldwide concern and the injury risk is greater for females than males. However, whiplash protection systems have shown to be more beneficial for males than females. Hence there is a need for improved tools to address female protection. The objective is to develop and evaluate a 50th percentile female rear impact crash dummy FE model. The model was based on the same design concept as the BioRID II. A scaling approach was developed and the first version, EvaRID V1.0, was implemented. Its dynamic response was compared to rear impact tests with female volunteers. The EvaRID model and volunteer tests showed good correlations until ~250 ms of the head and T1 accelerations, linear displacements and head angular displacement. Considerably less T1 angular displacement was found for the EvaRID; similar results were obtained for the BioRID II. Thus, the EvaRID V1.0 and BioRID II models have limitations at low δv (7km/h). The EvaRID model demonstrated the potential to become a valuable tool when evaluating and developing seats/whiplash protection systems, however, this will require updating the joint stiffness. The model may be used as a template for the development of a physical female dummy.

  • 3. Danial, Josef
    et al.
    Eriksson, Jenny
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Jämförelse av flöde och hastigheter från två olika cykelmätningsutrustningar2017Report (Other academic)
    Abstract [en]

    The purpose of this study was to compare cycle flows and speeds from two different cycle measurement equipment. The result has also been compared with the processed video data and manual counts. The measuring equipment are Viscando’s equipment OTUS3D and VTI´s TA-89. OTUS3D is a camera with 3D functionality, and it detects tracks and classifies these into different road user categories. TA-89 (where TA stands for Traffic Analyzer) is developed by VTI and is adapted for detecting both bicycles and motor vehicles. We also used a video camera from the OTUS3D system, to enable a manual calculation.

    The test site for the study is a pedestrian and bicycle path that crosses a ridge in Vallaskogen in Linköping. The area is located between the district of East Valla and campus. It is a fairly steep slope where the direction towards the campus is uphill and the direction to the East Valla / city center is downhill. Five days that did not include losses of flow were selected for the analyzes. The selected periods were 3 to 4 September (Saturday and Sunday) and 6 to 8 September (Tuesday to Thursday). In addition to this, we chose an hour with high flow and an hour with low flow where video processing was conducted. Furthermore, we used an hour and 50 minutes of manual counting.

  • 4.
    Ekström, Camilla
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Forsman, Åsa
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Förekomst av alkohol och droger hos förare av lastbil och buss som varit inblandade i dödsolyckor och olyckor med svåra personskador2018Report (Other academic)
    Abstract [en]

    The aim of this study was to improve the knowledge about the presence of alcohol, drugs and medicine among drivers of trucks or busses involved in fatal accidents and accidents with severe injuries. The study is based on material from two different databases, the Swedish Transport Administrations in-depth study database and the Swedish Traffic Accident Data Acquisition (Strada), owned by The Swedish Transport Agency. The survey of the presence of substances and background variables such as gender, age and type of accident among drivers under influence is presented in this study and based on accidents that occurred 2008–2015. The study includes 614 fatal accidents from the in-depth study database and 3381 accidents with severe injuries from Strada.

    For fatally injured drivers of trucks and busses in the in-depth database presence of alcohol was found in 15 percent, illegal drugs in 6 percent and medicine in 9 percent. Compared to the corresponding figure for drivers of cars, the presence of alcohol is lower, whereas the presence for illegal drugs and medicine, is at the same level. The presence is much lower when studying all drivers of trucks and busses involved in fatal accidents disregarding the drivers level of injury. The presence of alcohol among the drivers were 2 percent and 1 percent for illegal drugs respectively medicine. There are though differences between the type of vehicle driven. Among drivers of lighter trucks 16 of 156 drivers (10%) had presence of alcohol and/or illegal drugs. For drivers of trucks 4 of 369 (1%) and drivers of busses 0 of 96 drivers (0%) where under the influence of alcohol and/or illegal drugs.

  • 5.
    Ekström, Camilla
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Hellman, FredrikSwedish National Road and Transport Research Institute, Infrastructure, Pavement Technology.Haraldsson, MattiasSwedish National Road and Transport Research Institute, Society, environment and transport, Transport economics.
    Sammanställning av referat från Transportforum 20192019Conference proceedings (editor) (Other academic)
    Abstract [sv]

    VTI arrangerade Transportforum 9–10 januari 2019 i Linköping Konsert & Kongress. En konferens, som är störst i sitt slag i Norden och som 2019 innehöll 90 sessioner med en stor variation mellan ämnen. Temat för 2019 års inledande session var elektrifiering – möjligheter och utmaningar att nå klimatmålen.

  • 6.
    Ekström, Camilla
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Linder, Astrid
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Fatally injured cyclists in Sweden 2005–2015: analysis of accident circumstances, injuries and suggestions for safety improvements2017Report (Other academic)
    Abstract [en]

    Cycling is part of the sustainable transport system and plans are in place to increase this part of the transport system in Sweden, Europe as well as globally. Improving the safety for this group of roadusers is of great importance. The aim of this study was to identify patterns among fatally injured cyclists in Sweden, in order to suggest general safety improvements or improvements addressing different groups of cyclists as well as specific traffic conditions.

    The information was sourced from the in-depth study database of fatalities as well as the joint register for police and hospital injury and accident data, STRADA, in Sweden. Data was analysed and interpreted for an 11 year period from 2005–2015. The in-depth study of the fatalities provided details about the accidents and individuals involved in the accident and the information was retrieved by parameter values, in free text description and documents in the database. STRADA was used to sort official data within the in-depth study, assigning codes for accident type, complementing parameters and additional parameters.

    A total of 271 fatalities were identified and analysed where the majority of the accidents occurred during spring–autumn. Male fatalities accounted for two-thirds of the studied cases and in ages above 40, male fatalities are twice as many as female fatalities. Fatalities in Motor vehicle accidents are distributed in all age groups, while in the Single bike and Other bike category, there were no children and only a few young adults reported.

  • 7.
    Elvik, Rune
    et al.
    Institute of Transport Economics.
    Vadeby, Anna
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Hels, Tove
    Rigspolitiet, Denmark.
    van Schagen, Ingrid
    SWOV Institute for Road Safety Research, Netherlands.
    Updated estimates of the relationship between speed and road safety at the aggregate and individual levels2019In: Accident Analysis and Prevention, ISSN 0001-4575, E-ISSN 1879-2057, Vol. 123, p. 114-122Article in journal (Refereed)
    Abstract [en]

    Recent studies of the relationship between the speed of traffic and road safety, stated as the number of fatalities and the number of injury accidents, are reviewed and their results synthesised by means of meta-analysis. All studies were based on data fully or partly for years after 2000. Previously proposed models of the relationship between the speed of traffic and road safety, including the Power Model and an Exponential Model, are supported. Summary estimates of coefficients show that the relationship between speed and road safety remains strong. The Power Model and the Exponential Model both fit the data very well. The relationship between speed and road safety is the same at the individual driver level as at the aggregate level referring to the mean speed of traffic.

  • 8.
    Eriksson, Jenny
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Forsman, Åsa
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Niska, Anna
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Gustafsson, Susanne
    NTF.
    Sörensen, Gunilla
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    An analysis of cyclists' speed at combined pedestrian and cycle pathsIn: Traffic Injury Prevention, ISSN 1538-9588, E-ISSN 1538-957XArticle in journal (Refereed)
    Abstract [en]

    Objective: In Sweden, cyclists, pedestrians, and moped riders share the space on combined pedestrian and cycle paths, and their speeds may differ greatly. Both actual speed and speed differences can potentially influence the number of accidents on the shared paths. As a starting point, this article studies the speed component and how cyclists' speed varies at pedestrian and cycle paths depending on the day, week, and year; road user composition; and road design.

    Methods: Three data sources were used: Existing measurements of cycle speed and flow in 3 different Swedish municipalities, Eskilstuna (1 site, January-December 2015), Linkoping (6 sites, 4 weeks in September-October 2015), and Stockholm (10 sites, 1-5 days in August-September 2015); complementary measurements of cycle speed and flow in Linkoping (4 sites, 1-10 days in August-September 2016) and Stockholm (1 site, only part of 2 days in August 2016) were also conducted within the project, in addition to roadside observations of bicycle types at the 5 new sites.

    Results: The average speed of cyclists on the paths varied between 12.5 and 26.5 km/h. As expected, the lower average speeds were found in uphill directions, near intersections, and on paths with high pedestrian flows. The higher speeds were found in downhill directions and on commuter routes. In all, 70%-95% of road users observed on pedestrian and cycle paths were cyclists, and 5%-30% were pedestrians. The most common type of bicycle was a comfort bike, followed by a trekking bike. Electric-assisted bicycles and racer bikes occurred at all sites, with proportions of 1%-10% and 1%-15%, respectively. The 2 sites with the highest proportion of electric-assisted bicycles and racer bicycles also had the highest average speeds. The differences in average speed throughout the day, week, and year could only be assessed at one of the sites. Only small differences were found, with the most noticeable being that the average speed was lower in January and February (13.8 km/h) compared to the rest of the year (15.3-16.1 km/h). The average speed was also lower during daytime (14.7 km/h) than during other parts of the day (15.4-15.8 km/h).

    Conclusions: The relationship between bicycle type and measured speed was not entirely clear, but the results suggest that paths with higher proportions of electric and racer bicycles have higher average speeds. There also appears to be a connection between average speed and the width of the distribution; that is, the higher the average speed, the wider the speed distribution. More research is needed on how speed levels and speed variance affect accident risk.

  • 9.
    Eriksson, Jenny
    et al.
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance. VTI.
    Forsman, Åsa
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Niska, Anna
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Karlström, Jones
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Enhetlig metod för cykelflödesmätningar: en förberedande studie2019Report (Other academic)
    Abstract [en]

    There is an objective of increasing cycling nationally, regionally and in many Swedish municipalities. The extent of cycling can be followed up with either travel surveys (TSs) or by measuring the bicycle flow. The Traffic Analysis Authority was commissioned by the Government to develop and propose a uniform method for systematic measurements of bicycle traffic at a local and regional level and their report was published in January 2018. Bicycle traffic can be measured in different ways and the two most common methods are (1) measurements by counting bicycles (manually or with detecting equipment) in the street area or (2) travel surveys (TSs). In this report, we focus only on counting cyclists in the street area. Today, the methods of counting bicyclists are limited, and they do not enable estimations of kilometers travelled by bicycle per average day in a municipality.

    In order to achieve a broad application, it is necessary to investigate the possible obstacles that exist to use the Traffic Analysis's proposal for a uniform method, and this will be done in the following steps, where step 1 is described in this report:

    1. A preparatory study: Suggest a set-up of a pilot study

    2. Conduct a pilot study to establish a uniform and systematic approach, and finally

    3. Determine the final uniform and systematic method.

    The purpose of the preparatory study presented in this report is to adapt the Traffic Analysis's proposal to a uniform method for estimating the kilometers travelled by bicycle per average day, based on municipal conditions. The preparatory study will also lead to a proposal for a pilot study in which the adapted method is tested, and issues related to delimitations and definitions can be decided. The pilot study will be carried out in a follow-up project with a number of municipalities. This will result in a final determination of a uniform method for estimating the kilometers travelled by bicycle per average day.

  • 10.
    Eriksson, Jenny
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Trafiksäkerhet och trafiksystem, TST.
    Henriksson, Per
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Rogerson, Sara
    Swedish National Road and Transport Research Institute, Society, environment and transport, Traffic analysis and logistics.
    Sörensen, Gunilla
    Swedish National Road and Transport Research Institute, Traffic and road users, Trafiksäkerhet och trafiksystem, TST.
    Silvano, Ary P.
    Swedish National Road and Transport Research Institute, Traffic and road users, Trafiksäkerhet och trafiksystem, TST.
    Nilsson, Annika
    Trivector.
    Wahl, Charlotte
    Sweco.
    Ullberg, Martin
    Sweco.
    Adell, Emelie
    Trivector.
    Intressent- och behovsanalys för resvaneundersökningar: resultat från intervjuer och enkätundersökning2017Report (Other academic)
    Abstract [en]

    In Sweden, national travel surveys are regularly carried out by Transport Analysis, a governmental agency. However, in the last decade travel survey studies have suffered with problems such as high rate of non-response, coverage, costs and reporting burden. Therefore, this project is underway aimed at investigating and proposing new methods for data collection on people’s mobility. The project is divided into five deliverables (work packages – WP), of which this report is the second one (WP2). The purpose is to carry out an analysis of stakeholders’ needs regarding future requirements of travel surveys. This includes identifying the questions that travel surveys can answer.

    Telephone interviews have been conducted with 20 stakeholder representatives and internet-based questionnaires were sent to 142 respondents (response 81 persons, response rate 57 percent). The stakeholders’ representatives were classified into three types of organizations: public sector, research organizations and other actors. Based on their own experience, an analysis has been conducted regarding what is requested from the national travel survey. The analysis show that key aspects of today’s and tomorrow’s travel survey users include (i) mode choice, (ii) trip purpose, (iii) how travel behavior changes over time, and (iv) how different groups travel. To be able to answer these questions, both individual and travel information are required.

  • 11.
    Eriksson, Jenny
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Lindborg, Eva
    Trafikanalys.
    Adell, Emeli
    Trivector .
    Holmström, Andreas
    Trafikanalys.
    Silvano, Ary P.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Nilsson, Annika
    Trivector .
    Henriksson, Per
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Wiklund, Mats
    Trafikanalys.
    Dahlberg, Lina
    Trivector.
    New Ways of Collecting Individual Travel Information: Evaluation of data collection and recruitment methods2018Report (Other academic)
    Abstract [en]

    The overall purpose of the project is to conduct a demonstration study that shows how two data collection methods that have been developed to collect travel survey data perform in the field, and how they perform compared with traditional TS (i.e., postal questionnaires and/or telephone interviews). The project is also intended to provide a better understanding of the ways in which different recruitment methods of respondents can be used so that future TS can be more cost effective.

    The two collection methods tested consist of a mobile app and an online questionnaire with a map to assist the respondents to identify travel destinations. Three recruitment methods were used, i.e., recruitment via random sampling, a web panel, and crowdsourcing. The portion of the random sample that received an online questionnaire was divided into two groups. Half the group was given no incentive, while the other half received a gift card worth SEK 100 after answering the questioner. Those who were recruited via a web panel and were to use the mobile app were rewarded in the form of a gift card worth SEK 100 if, at minimum, they made corrections to trips made on one day registered in the mobile app. A nonresponse analysis was performed of the random sample for both the online questionnaire and the mobile app. Cost estimates for each collection method and recruitment method were also performed, as were uncertainty estimates.

    Overall, the study shows that the mobile app registered significantly more trips per respondent than did the online questionnaire, while the distances travelled were comparable. There are several possible interpretations of this. One is that people who responded to the online questionnaire either forget about and/or combined short trips (particularly trips made for the purposes of leisure or shopping, and using the travel modes walking and car). One presumable explanation for this is that it is easier to confirm/correct the trips that the mobile app suggests than it is to recall and enter all trips in an online questionnaire. Another possible interpretation is that people responding to different data collection methods have different travel patterns. Yet another explanation is connected to technique issues regarding the different data collection methods.

  • 12.
    Eriksson, Jenny
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Lindborg, Eva
    Trafikanalys.
    Adell, Emeli
    Trivector.
    Holmström, Andreas
    Trafikanalys.
    Silvano, Ary P.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Nilsson, Annika
    Trivector.
    Henriksson, Per
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Wiklund, Mats
    Trafikanalys.
    Dahlberg, Lina
    Trivector.
    Nya sätt att samla in individuell resvaneinformation: utvärdering av insamlings- och rekryteringsmetoder2018Report (Other academic)
    Abstract [sv]

    Inom samverkansprogrammet Nästa generations resor och transporter, som Trafikanalys är huvudansvarig för, har man identifierat ett behov av att finna och utveckla nya lösningar för resvaneundersökningar (RVU:er). Bakgrunden till detta är bland annat sjunkande svarsfrekvenser med dagens metoder, vilket skulle kunna ge problem med representativiteten. Det anses som mycket angeläget att utveckla nya metoder för datainsamling för framtidens RVU:er, både på kort och lång sikt. Det övergripande syftet med projektet är att göra en demonstrationsstudie som visar hur två datainsamlingsmetoder som har utvecklats för att samla in resevaneundersökningsdata presterar i fält, samt hur de presterar jämfört med ”traditionell” RVU (postal enkät och/eller telefonintervjuer). Projektet syftar också till att få bättre förståelse för hur olika rekryteringsmetoder kan användas för att framtida RVU:er ska kunna bli mer kostnadseffektiva. De två insamlingsmetoder som testats är webbenkät med karta och mobilapp. Tre rekryteringsmetoder har använts och dessa är rekrytering via slumpmässigt urval, webbpanel och crowdsourcing. Den del av det slumpmässiga urvalet som fick en webbenkät delades in i två grupper. Halva gruppen fick inget incitament medan den andra halvan fick ett presentkort till ett värde av 100 kr. De som rekryterades via webbpanel och som skulle använda mobilappen, fick en belöning i form av ett presentkort till ett värde av 100 kr om minst en dags resor rättades i mobilappen. Det genomfördes en bortfallsanalys på det slumpmässiga urvalet för både webbenkät och mobilapp. En kostnadsuppskattning av respektive insamlingsmetod och rekryteringsmetod har också genomförts. Vi tog även fram osäkerhetsskattningar. Studien lokaliserades till Göteborgsregionen eftersom Göteborgs stad då genomförde en traditionell resvaneundersökning under samma period. Syftet med att välja samma område och period var att kunna jämföra våra mindre pilotundersökningar med resultaten från en större traditionell undersökning. Målpopulation var invånare mellan 16–84 år i 21 kommuner i Göteborgsregionen, dvs. samma som i Göteborgs stads undersökning.

  • 13.
    Eriksson, Jenny
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Lindborg, Eva
    Trafikanalys.
    Adell, Emeli
    Trivector.
    Holmström, Andreas
    Trafikanalys.
    Silvano, Ary P.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Nilsson, Annika
    Trivector.
    Henriksson, Per
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Wiklund, Mats
    Trafikanalys.
    Dahlberg, Lina
    Trivector.
    Nya sätt att samla in inviduell resvaneinformation: Utvärdering av insamlings- och rekryteringsmetoder2018Report (Other academic)
    Abstract [sv]

    Inom samverkansprogrammet Nästa generations resor och transporter, som Trafikanalys är huvudansvarig för, har man identifierat ett behov av att finna och utveckla nya lösningar för resvaneundersökningar (RVU:er). Bakgrunden till detta är bland annat sjunkande svarsfrekvenser med dagens metoder, vilket skulle kunna ge problem med representativiteten. Det anses som mycket angeläget att utveckla nya metoder för datainsamling för framtidens RVU:er, både på kort och lång sikt.

    Det övergripande syftet med projektet är att göra en demonstrationsstudie som visar hur två datainsamlingsmetoder som har utvecklats för att samla in resevaneundersökningsdata presterar i fält, samt hur de presterar jämfört med ”traditionell” RVU (postal enkät och/eller telefonintervjuer). 

    Projektet syftar också till att få bättre förståelse för hur olika rekryteringsmetoder kan användas för att framtida RVU:er ska kunna bli mer kostnadseffektiva. De två insamlingsmetoder som testats är webbenkät med karta och mobilapp. Tre rekryteringsmetoder har använts och dessa är rekrytering via slumpmässigt urval, webbpanel och crowdsourcing.

  • 14.
    Eriksson, Jenny
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Liu, Chengxi
    Swedish National Road and Transport Research Institute, Society, environment and transport, Traffic analysis and logistics.
    Forward, Sonja
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Forsman, Åsa
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Niska, Anna
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Tapani, Andreas
    Swedish National Road and Transport Research Institute, Society, environment and transport, Traffic analysis and logistics.
    Wallén Warner, Henriette
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Säkerhetseffekten av ökat cyklande: kartläggning av nuläget för att planera för framtiden2017Report (Other academic)
    Abstract [en]

    During the last decades, cycling has been highlighted as a travel mode with many positive qualities. The documents of Swedish national strategy reveal a trend of an increased cycling. At the same time, it is important that the safety of cyclists must be improved so that an increased cycling does not contribute to more injuries and fatalities in accidents. To cope with the increased cycling without compromising the safety, there is fore example, a need for better understanding of the relationship between the cycling flow and the injuries in various traffic environments.

    In this project, three different studies were carried out to understand how the trend of cycling changes over time and how cyclists' injury risk is influenced by the cycling flow and the traffic environment. In the first study, a travel demand model has been developed that includes both mode choice and destination choice for cycling. In the second study, models for cyclists’ injury risks have been developed for different types of accidents and traffic environments. In the third study, interactions between different road users have been observed, to study how these are affected by the level of bicycle flow. Overall, the studies in this project have shown that bicycle flow is an important factor influencing cyclists’ accident risks. Higher bicycle flow corresponds to fewer interactions per cyclist and a lower risk of injury in a single bicycle accident as well as in a collision accident with motorised vehicles. We have also been able to demonstrate that it is possible to model travel choices and destination choice of cyclists and to develop models that describe cyclists’ injury risk. However, to provide better estimates, data with better quality are necessary for the model inputs, especially when it comes to the cycling and the description of cycling infrastructure.

  • 15.
    Eriksson, Jenny
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Trafiksäkerhet och trafiksystem, TST.
    Niska, Anna
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Sörensen, Gunilla
    Swedish National Road and Transport Research Institute, Traffic and road users, Trafiksäkerhet och trafiksystem, TST.
    Gustafsson, Susanne
    Swedish National Road and Transport Research Institute, Traffic and road users, Trafiksäkerhet och trafiksystem, TST. NTF.
    Forsman, Åsa
    Swedish National Road and Transport Research Institute, Traffic and road users, Trafiksäkerhet och trafiksystem, TST.
    Cyklisters hastigheter: Kartläggning, mätningar och observation2017Report (Other academic)
    Abstract [en]

    Many different road users share space on pedestrian and cycle paths, and their speeds may differ greatly. Differences in speed can complicate the interactions between road users which in turn may cause incidents and accidents. The purpose of this project is to enhance the understanding of cycle speeds on the pedestrian and cycle paths and to understand how the cyclists adapt their speed to other road users and to the surrounding environment. Three different data collection methods were used: Previous measurements of cycle speed and flow in three different municipalities, Eskilstuna, Linköping and Stockholm (18 locations); new measurements in Linköping (4 locations) and Stockholm (1 location); and new observation studies of bicycle types at these locations.

    The average speed of cyclists on the paths selected varies between 15–25 kilometer per hour. As expected, the lower average speeds were found in the uphill directions, near intersections and in paths with high pedestrian flow. The higher speeds were found in downhill directions and on commuter routes. No general increase in cyclists’ speed was found between years, neither in mean speed nor in proportion of high-speed cyclists. However, bicycle flow has increased in many of the locations over the years. This implies that the number of cyclists holding a high speed, above 30 kilometer per hour, will be increased, even if the proportion of high-speed cyclists stays the same. This may mistakenly be interpreted as increased mean speed. About 70–95 percent of the road users observed on the pedestrian and cycling paths were cyclists and roughly 5–30 percent were pedestrians. An extremely small proportion were mopeds, 0.2 percent. The comfort bike was the most common type, followed by the trekking bike. The electric and racer bike occurred in all locations, but varied 1–10 percent respectively 1–15 percent. The relationship between the type of bike and the speed claim is not entirely clear, but cyclists on the electrical and racer bikes generally have higher speed claims.

  • 16.
    Eriksson, Olle
    et al.
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Sörensen, Gunilla
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Motorcykelflöden sommarhalvåren 2006 – 2017: teknisk rapport, version 1.02018Report (Other academic)
    Abstract [sv]

    Trafikverket ser ett ökat behov av uppgifter om trafikflöden och fordonshastigheter för motorcyklar, speciellt med avseende på tillförlitliga data inom trafiksäkerhetsområdet. Vid olycksanalys är det till exempel svårt att finna exponeringsdata för motorcykliste. För mc-flöden finns en särskild metod framtagen, se PM ”Beräkningar av mc-flöden på Trafikverkets ÅDT-avsnitt” (Eriksson, 2013).

    Skattningar av trafikflöden tas fram på basis av ett 12-årigt mätprogram för årsmedel-dygnstrafik (ÅDT). Sedan år 2006 skattas även mc-flöde under sommarhalvåret med hjälp av data från mätprogrammet. Skattningar av mc-flöden på de statliga vägarna år 2006–2012 utfördes enligt metoden beskriven i Eriksson (2013). Motsvarande skattningar gjordes även för år 2013–2014 med denna metod, enligt uppgift från Trafikverket. Metoden användes också för skattningar år 2015, men då genomfördes dessutom ytterligare rimlighetskontroller och korrigeringar av data, vilket är beskrivet i teknisk rapport ”Trafikflöden för motorcyklar 2015” (Sörensen och Eriksson, 2016). Metoden vidareutvecklades för skattningarna år 2016, se Sörensen, Henriksson och Yahya (2017).

    Resultaten av mc-flödesskattningarna har rapporterats till Trafikverket i tabellform uppdelade per mätår och vägkategori. Trafikverket har publicerat resultaten i kartor på sin websida.

  • 17.
    Flannagan, Carol. A. C.
    et al.
    University of Michigan.
    Bálint, András
    Chalmers University of Technology.
    Klinich, Kathleen. D.
    University of Michigan.
    Sander, Ulrich
    Autoliv Research.
    Manary, Miriam A.
    University of Michigan.
    Cuny, Sophie
    Centre Européen d’Etudes de Sécurité et d’Analyse des Risques.
    McCarthy, Michael
    TRL (Transport Research Laboratory).
    Phan, Vuthy
    Centre Européen d’Etudes de Sécurité et d’Analyse des Risques.
    Wallbank, Caroline
    TRL (Transport Research Laboratory).
    Green, Pauk E.
    University of Michigan.
    Sui, Bo
    Autoliv Research.
    Forsman, Åsa
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Fagerlind, Helen
    Chalmers University of Technology.
    Comparing motor-vehicle crash risk of EU and US vehicles2018In: Accident Analysis and Prevention, ISSN 0001-4575, E-ISSN 1879-2057Article in journal (Refereed)
    Abstract [en]

    This study examined the hypotheses that passenger vehicles meeting European Union (EU) safety standards have similar crashworthiness to United States (US) -regulated vehicles in the US driving environment, and vice versa. The first step involved identifying appropriate databases of US and EU crashes that include in-depth crash information, such as estimation of crash severity using Delta-V and injury outcome based on medical records. The next step was to harmonize variable definitions and sampling criteria so that the EU data could be combined and compared to the US data using the same or equivalent parameters. Logistic regression models of the risk of a Maximum injury according to the Abbreviated Injury Scale of 3 or greater, or fatality (MAIS3+F) in EU-regulated and US-regulated vehicles were constructed. The injury risk predictions of the EU model and the US model were each applied to both the US and EU standard crash populations. Frontal, near-side, and far-side crashes were analyzed together (termed "front/side crashes") and a separate model was developed for rollover crashes.

    For the front/side model applied to the US standard population, the mean estimated risk for the US-vehicle model is 0.035 (sd = 0.012), and the mean estimated risk for the EU-vehicle model is 0.023 (sd = 0.016). When applied to the EU front/side population, the US model predicted a 0.065 risk (sd = 0.027), and the EU model predicted a 0.052 risk (sd = 0.025). For the rollover model applied to the US standard population, the US model predicted a risk of 0.071 (sd = 0.024), and the EU model predicted 0.128 risk (sd = 0.057). When applied to the EU rollover standard population, the US model predicted a 0.067 risk (sd = 0.024), and the EU model predicted 0.103 risk (sd = 0.040).

    The results based on these methods indicate that EU vehicles most likely have a lower risk of MAIS3+F injury in front/side impacts, while US vehicles most likely have a lower risk of MAIS3+F injury in llroovers. These results should be interpreted with an understanding of the uncertainty of the estimates, the study limitations, and our recommendations for further study detailed in the report.

  • 18.
    Forsman, Åsa
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Utvärdering av alkolås efter rattfylleri: registerstudie2018Report (Other academic)
    Abstract [en]

    Since 1 January 2012, there is a permanent alcohol interlock program for drink driving offenders in Sweden. The Swedish Transport Agency is responsible for the program, that is voluntary and applies to all types of driver's licenses. The program includes both a one-year and a two-year alternative. The two-year program applies to offenders that have committed a severe drink driving offence (BAC ≥ 1 g/L, the legal limit in Sweden is 0.2 g/L), have an earlier offence within the previous five years, or have the diagnosis alcohol abuse or alcohol dependence. All others are assigned to the oneyear program.

    The interlock program has been evaluated in three studies: a register based study, a questionnaire study, and an interview study. The results from the register based study is presented in this report, while the other studies have been published earlier. Results and conclusions from all three studies will be summarized in an upcoming final report.

    The aim of the study was to estimate the participation rate in the program, and to follow both participants and non-participants during the time in the program or the time without a driver’s license, respectively. The study is based on data from the Swedish road traffic register and a case management system, both administrated by the Swedish Transport Agency. The effectiveness of reducing recidivism in drink driving during the program have been shown in previous studies and are not evaluated here.

  • 19.
    Forsman, Åsa
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Gustafsson, Susanne
    NTF.
    Drink drivers' views of a voluntary alcohol interlock program for drink driving offenders in Sweden2018Conference paper (Refereed)
    Abstract [en]

    A permanent alcohol interlock program was introduced in Sweden in 2012. The program is voluntary and makes it possible for drivers that are apprehended by the police to keep their driver’s license if they install an alcohol interlock in their vehicle. The Swedish Transport Agency is responsible for the program and it applies to all types of driver’s licenses. The duration of the program is one or two years, depending on the severity of the drink driving offence. A previous study showed that about 30 percent of all drivers that had their license withdrawn due to drink driving applied for and was granted participation in the program, 10 percent were assigned to the one-year program and 20 percent to the two-year program. Moreover, the age groups 35–44, 45–54 and 55–64 have the highest participation rates (in relation to the total number of drink drivers), about 35 percent, while the youngest (≤24) and oldest (≥75) have participation rates of about 20 and 10 percent, respectively.

    The aim of this study was to increase the knowledge of the drink drivers’ views of the program, both participants and those who chose not to participate. More specifically, we were interested in why they have chosen or not chosen to participate in the program and their views on the application process, doctor visits and the handling of the interlocks. We also wanted to know if their health and drinking habits had changed after the drink driving offence.

  • 20.
    Forsman, Åsa
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Trafiksäkerhet och trafiksystem, TST.
    Gustafsson, Susanne
    Swedish National Road and Transport Research Institute, Traffic and road users, Trafiksäkerhet och trafiksystem, TST.
    Participation Rates in a Voluntary Alcohol Interlock Program for Drink Drivers in Sweden2016In: 21st International council on alcohol, drugs and traffic safety conference T2016: Conference proceedings, 2016Conference paper (Refereed)
    Abstract [en]

    After a long trial period, an alcohol interlock program was permanently introduced in Sweden in 2012. Participation in the program is voluntary and the duration of the program is one or two years, depending on the severity of the drink driving offence. An evaluation of the program during the trial period showed a participation rate of about 11%. Aim: The main aim of the study was to estimate the participation rate in the interlock program and evaluate if the changes made from the trial period had led to increased participation. Reasons for denied participation and the time between the drink driving offence and decision about participation in the program were also studied.

    A sample of about 3600 drivers who had their license withdrawn due to drink driving was investigated. The data includes age and gender, information about the drink driving offence and the application process.

    The participation rate in the permanent program is about 30%. The age group with the highest participation is drivers between 35 and 64 years old with about 35% participation. Moreover, the participation rate of drivers with BAC > 1 g/L is almost twice as high as the rate for drivers with BAC < 1 g/L.

    The study shows that the participation rate has increased from about 11% in the trial period to about 30% in the permanent program. Thus, the attempt of increasing the rate has been successful.

  • 21.
    Forsman, Åsa
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Gustafsson, Susanne
    NTF.
    Nyberg, Jonna
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Utvärdering av alkolås efter rattfylleri: Sammanfattande slutrapport2018Report (Other academic)
    Abstract [en]

    Since January 1, 2012, there is a permanent alcohol interlock program for drink driving offenders in Sweden. The Swedish Transport Agency is responsible for the program. The interlock program has been evaluated in three studies: a register-based study, a questionnaire study, and an interview study. This final report summarizes results and conclusions from all three studies.

    The aim of the evaluation was to estimate the participation rate, but also to increase the understanding of why one chooses or does not choose to participate and to study the individual's experience of the program. The results from the studies show that:

    • The participation rate of the program was about 30 percent.
    • Both participants and non-participants in the interlock program experienced an improved health when they were asked a while after the drink driving offence and they also reported areduced alcohol consumption.
    • The largest barrier to increase the participation rate in the program is the cost, but there arealso other reasons that prevent drivers to apply.
    • Many participants experienced shortcomings in the information from the Transport Agency,both regarding the application process and regarding the mandatory parts of the program.
    • About 31 percent of the participants in the two-year program had the diagnosis alcohol abuseor alcohol dependence.
  • 22.
    Forsman, Åsa
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Vadeby, Anna
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System. VTI.
    Förslag på metod för att mäta den subjektiva upptäcktsrisken med avseende på rattfylleribrott2017Report (Refereed)
    Abstract [sv]

    Syftet med det här projektet har varit att föreslå en metod för att utvärdera förändringar i polisens arbetssätt med avseende på rattfylleriövervakning. Huvudsakligen handlar det om att mäta den subjektiva upptäcktsrisken, men utvärdering av polisens arbetssätt och kommunikation föreslås också. Det finns två viktiga delar i polisens strategi för övervakning: kontroller och kommunikation. Den sammantagna effekten av detta behöver utvärderas men man bör även titta på de olika delarna var för sig. I detta pm föreslås därför en utvärdering med tre olika delstudier. För var och en av delstudierna förutsetts att man gör både före- och eftermätningar i dels det område där arbetssättet förändras och dels i ett kontrollområde. Vi är dock medvetna om detta är en ideal situation som kanske inte är möjlig i praktiken. Om en utvärdering kommer att genomföras kan därför förslaget behöva modifieras för att passa de förutsättningar som då råder. De tre olika delstudierna är: Delstudie 1: Utvärdering av polisens implementering Den här delstudien är uppdelad i två nivåer där syftet med nivå 1 är att studera hur polisen ändrat sitt arbetssätt och syftet med nivå 2 är att studera vad som fungerat bra och mindre bra i implementeringen från polisens perspektiv. Nivå 1 är nödvändig för att tolka resultatet av övriga delar i utvärderingar och nivå 2 är en fördjupad utvärdering. Exempel på data som föreslås samlas in är: var och när kontroller genomförs, resultatet av kontrollerna samt informationsspridning till allmänheten. Dessutom föreslås intervjuer med poliser på olika befattningar som deltagit i implementeringen. Delstudie 2: Enkätstudie För att mäta den subjektiva upptäcktsrisken hos förare i allmänhet föreslås en enkätstudie där ett frågeformulär skickas ut via post till ett slumpmässigt urval ur körkortsregistret eller befolkningsregistret (frågorna ska också kunna besvaras som en webbenkät). Målgruppen är personer som har körkort för minst en typ av motorfordon och som också framfört något fordon det senaste året. Ett förslag på utformning av en enkät med 14 frågor har tagits fram. Två frågor behandlar den subjektiva upptäcktsrisken, en som avser upptäcktsrisk på en övergripande nivå och en som avser upptäcktsrisk i fem specifika situationer. Resten av enkäten består av bakgrundsfrågor och frågor om bland annat riskmedvetenhet, normer, om man själv eller någon man känner har blivit stoppad i en kontroll och om man fått information om kontroller via media. Delstudie 3: Utvärdering av kommunikation i sociala medier Syftet med den här delstudien är att bedöma hur väl polisen lyckas nå ut med sitt budskap. Vi föreslår att man samlar in följande typ av information: omfattningen av polisens aktiviteter på sociala medier, spridning, innehåll och karaktär på kommentarerna. Det huvudsakliga syftet med utvärderingen är att mäta subjektiv upptäcktsrisk hos förarpopulationen och jämföra om den har förändrats före och efter att polisen har genomfört förändringar som rör rattfylleriövervakningen. För att uppnå syftet är det nödvändigt att genomföra åtminstone nivå 1 i delstudie 1 (utvärdering av polisens implementering) och delstudie 2 (enkätstudie). Övriga delar är dock också mycket viktiga för att förstå helheten och vi förordar därför att alla delar i utvärderingen genomförs.

  • 23.
    Forsman, Åsa
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Vadeby, Anna
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Injured motorcyclists in Sweden: Where do the crashes occur and what factors influence the injury severity?2018In: Proceedings of 7th Transport Research Arena TRA 2018, April 16-19, 2018, Vienna, Austria, 2018Conference paper (Refereed)
    Abstract [en]

    Trends in traffic fatalities show that the development for motorcyclists has fallen behind other road users. It is therefore crucial to improve traffic safety for this road user group. The study analyses where in the road network motorcyclists are injured and whether injury severity differs between parts of the network. Injury severity is also examined in relation to other variables such as age, gender, and motorcycle engine performance (i.e., power-to-weight ratio). The results indicate that motorcyclists, relatively more often than passenger car occupants, are injured on low-volume roads that are not subject to any major safety improvements. It is therefore crucial to also encourage other safety measures targeting rider behaviour and vehicle safety. Moreover, analyses of injury severity indicate that, in multiple-vehicle crashes involving motorcycles, the odds of being killed or severely injured are lower on roads with median barriers (i.e., motorways and 2+1 roads) than on two-lane roads.

  • 24.
    Forsman, Åsa
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Vadeby, Anna
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Gundlegård, David
    Linköpings universitet.
    Ringdahl, Rasmus
    Linköpings universitet.
    Utvärdering av hastighetsmätningar med blåtandssensorer: jämförelse med data från MCS (Motorway Control System)2018Report (Other academic)
    Abstract [en]

    The aim of this project was to compare vehicle speed measurements using Bluetooth detection with radar measurements from a Motorway Control System (MCS). Of particular interest was to evaluate whether the method could be used in before-after studies of road safety measures such as speed cameras or other speed reducing measures.

    The results from the study show that:

    • The penetration rate varies between 12 and 16 percent depending on the site and whether it is a weekday or weekend.

    • Bluetooth measurements provide stable results with respect to average vehicle speed at diurnal level. Comparisons with MCS data show that the results of the two methods follow each other well and the difference between methods is about the same from day to day.

    • Speed measurements with Bluetooth sensors are judged to be sufficiently reliable, on the evaluated road type, to be used in before-after studies of various road safety measures.

  • 25.
    Forsman, Åsa
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Wallhagen, Susanne
    NTF.
    Drink drivers’ views of a voluntary alcohol interlock programme for drink driving offenders in Sweden2019In: Accident Analysis and Prevention, ISSN 0001-4575, E-ISSN 1879-2057, Vol. 124, p. 210-218Article in journal (Refereed)
    Abstract [en]

    A permanent alcohol interlock programme was introduced in Sweden in 2012. The programme is voluntary and allows drink driving offenders to keep their driving licenses if they install alcohol interlocks in their vehicles. The duration of the programme is one or two years, depending on the severity of the drink driving offence. This study aims to improve our knowledge of drink drivers’ views of the programme, among both participants and those who chose not to participate. These views were collected through paper questionnaires mailed to the drink drivers’ residences. Of 1550 questionnaires mailed to participants and 1492 to non-participants, 689 and 408 were completed, for response rates of 45% among participants and 28% among non-participants. For participants who were employed or had their own business (n = 513), the main reasons for choosing the alcohol interlock were the need to operate a vehicle at work (69.6%, 95% CI: 65.6–73.6%) and to get to/from work (69.4%, 95% CI: 65.4–73.4%). For those not working (n = 153), the main reasons for participating were that the driving license was required to have a social life and meaningful leisure time (79.7%, 95% CI: 73.3–86.2%) and for shopping (65.4%, 95% CI: 57.7–73.0%). For non-participants, the main reasons for not applying were programme costs (64.4%, 95% CI: 59.5–69.3%), being afraid of being considered alcoholics (37.1%, 95% CI: 32.2–42.1%), and doing well without a license (26.5%, 95% CI: 22.0–31.0%). The results also indicate improved health after the drink driving offence. The largest improvement was found in participants in the two-year programme, in which the proportion of respondents who felt good or very good increased by 39.4% (95% CI: 34.2–44.5%) compared to before the drink driving offence.

  • 26.
    Forward, Sonja
    et al.
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Hedström, Ragnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Nyberg, Jonna
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Sörensen, Gunilla
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Bolling, Anne
    Swedish National Road and Transport Research Institute, Traffic and road users, Vehicle technology and simulation.
    Säkerhet och arbetsmiljö vid väg- och spårarbeten: implementeringsprocessen av nytt regelverk och dess effekter2016Report (Other academic)
    Abstract [en]

    The purpose of this study was, through the use of interviews, case studies, and a reference group meeting to describe and analyze the implementation process of new and revised regulations. This applies to both road and track in their administrative and operational activities within the Swedish Transport Administration and their contractors. The aim was also to analyze the effects the new and revised regulations had on roles and responsibilities but also their own and others' safety. For work on the road, new rules and regulations were established, which became effective as of 1st of January 2013. With regard to rail, a number of measures were implemented in 2011 to improve safety that included changed rules for work on and beside the tracks.

  • 27. Gregersen, Nils Petter
    et al.
    Gustafsson, Susanne
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Sörensen, Gunilla
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic safety, society and road-user.
    Nyberg, Jonna
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Forsberg, Inger
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Utvärdering av miljöinslagen i körkortsutbildningen: en studie av effekter på körbeteende och bränsleförbrukning2016Report (Other academic)
    Abstract [en]

    The aim of the study was to measure the effects of the education in environmental friendly driving that is included in the Swedish driver education for license class B on fuel consumption and a selection of driving behaviour that are typical for environmental friendly driving among drivers with license since half a year. Comparisons were made between a group of 25 drivers who estimated that they had much  education in environmental friendly driving and a group of 25 drivers who estimated that they had  little or none such education. Those with much education in environmental friendly driving had participated more in both driving lessons and theory lessons at driving schools than those with little education. The drivers drove an instrumented car along a pre-defined road of 30 km where 12 parts were used to collect data about fuel consumption and a selection of different driving behaviour.  The results show that education in environmental friendly driving during driver licensing has had an effect on fuel consumption. The group with much education used 8.7 percent less fuel than the group with little education. However, an expert/educator in environmental friendly driving who was driving the same roads had a much lower fuel consumption. This can probably be explained by the more complex driving behaviour, such as driving in mixed traffic with zero consumption and to minimize declutching and braking to the advantage of engine braking, requiring a higher mental load of novice drivers. 

  • 28.
    Gustafsson, Susanne
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Nyberg, Jonna
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Utvärdering av alkolås efter rattfylleri: intervjustudie2017Report (Other academic)
    Abstract [en]

    A permanent alcohol interlock program for drink drivers came into force on 1 January 2012. The Swedish Transport Agency is responsible for the program which applies to all types of driver’s licenses. The program includes both a one-year and a two-year alternative. The two-year program applies to offenders whom have committed a severe drink driving offence (BAC > 1 g/L, the legal limit in Sweden is 0.2 g/L), have an earlier offence within the previous five years, or have the diagnosis alcohol use disorder or alcohol dependence. All others are assigned to the one-year program. Several aspects of the alcohol interlock program are evaluated at VTI. This report presents the results of an interview study with a total of 31 drivers who had committed a drink driving offense. They were interviewed both at a meeting, and at follow-up telephone interviews. The drivers are 11 people who participated in the two-year program, 10 people who participated in the one-year program and 10 people who did not participate in the interlock program.

  • 29.
    Hjort, Mattias
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Driver and vehicle.
    Gustafsson, Susanne
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Henriksson, Per
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Forsman, Åsa
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic safety, society and road-user.
    Tunga lastbilars däckanvändning och olycksrisk vintertid2017Report (Other academic)
    Abstract [en]

    In Sweden, it is today regulated that winter tyres must be used on the drive axle of heavy vehicles (total weight in excess of 3,500 kg) during the winter season period, December 1 to March 31, in case of winter conditions. This requirement is based entirely on accessibility, and it is considered that winter tyres on the drive axle provides better conditions for heavy vehicles to go forward in icy and snowy conditions. Previous accident risk studies have not been able to demonstrate that the use of winter tyres instead of summer tyres for heavy vehicles in winter could lead to reduced risk of accidents. In Norway and Finland, the regulations on tyre use for heavy vehicles in winter time has recently been revised. Prior to a discussion of possible regulations in Sweden on winter tyres also on other axles, there is reason to update the previous accident risk studies. The purpose of this study has been to calculate the risk of accidents on ice/snow conditions for comparison between summer and winter tires for heavy trucks. The study was performed according to the method previously used in the VTI studies conducted in 2000 and 2008. This meant that two questionnaires were sent out by the end of the winter 2015/2016. One survey to analyse the vehicle mileage on ice/snow conditions with different combinations of tires, and one questionnaire directed solely to the vehicle owners whose vehicles according Strada during the winter season have been involved in an injury accident. Accident risk calculations were limited to vehicles with a total weight of 16 tons.

  • 30.
    Kjeldgard, Linnea
    et al.
    Karolinska Institutet.
    Ohlin, Maria
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Elrud, Rasmus
    Karolinska Institutet.
    Stigson, Helena
    Karolinska Institutet.
    Alexanderson, Kristina
    Karolinska Institutet.
    Friberg, Emilie
    Karolinska Institutet.
    Bicycle crashes and sickness absence: a population-based Swedish register study of all individuals of working ages2019In: BMC Public Health, ISSN 1471-2458, E-ISSN 1471-2458, Vol. 19, article id 943Article in journal (Refereed)
    Abstract [en]

    Background In recent years, bicycle injuries have increased, yet little is known about the impact of such injures on sickness absence (SA) and disability pension (DP). The aim was to explore SA and DP among individuals of working ages injured in a bicycle crash.

    Method A nationwide register-based study, including all individuals aged 16-64years and living in Sweden, who in 2010 had in- or specialized out-patient healthcare (including emergency units) after a bicycle crash. Information on age, sex, sociodemographics, SA, DP, crash type, injury type, and injured body region was used. We analyzed individuals with no SA or DP, with ongoing SA or full-time DP already at the time of the crash, and with new SA >14days in connection to the crash. Crude and adjusted odds ratios (OR) with 95% confidence intervals for new SA were estimated by logistic regression.

    Results In total, 7643 individuals had healthcare due to a new bicycle crash (of which 85% were single-bicycle crashes). Among all, 10% were already on SA or full-time DP at the time of the crash, while 18% had a new SA spell. The most common types of injuries were external injuries (38%) and fractures (37%). The body region most frequently injured was the upper extremities (43%). Women had higher OR (1.40; 1.23-1.58) for new SA than men, as did older individuals compared with younger (OR 2.50; 2.02-3.09, for ages: 55-64 vs. 25-34). The injury types with the highest ORs for new SA, compared with the reference group external injuries was fractures (8.04; 6.62-9.77) and internal injuries (7.34; 3.67-14.66). Individuals with traumatic brain injury and injuries to the vertebral column and spinal cord had higher ORs for SA compared with other head, face, and neck injuries (2.72; 1.19-6.22 and 3.53; 2.24-5.55, respectively).

    Conclusions In this explorative nationwide study of new bicycle crashes among individuals of working ages, 18% had a new SA spell in connection to the crash while 10% were already on SA or DP. The ORs for new SA were higher among women, older individuals, and among individuals with a fracture.

  • 31.
    Kröyer, Höskuldur
    et al.
    Trafkon.
    Eriksson, Jenny
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Forsman, Åsa
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Cykling under vintermånaderna: Förstudie om exponering2017Report (Other academic)
    Abstract [sv]

    I denna studie kommer vi att fokusera på sambanden mellan cykelexponeringen, årstiden och väderförhållanden. Cykling är för närvarande ett mycket uppmärksammat transportslag i hela norden. De senaste åren har dock cyklingen i Sverige minskat. Tidigare forskning har visat att de är flera olika faktorer som påverkar benägenheten att cykla. Forskningen har visat att , hälsa och motion, upplevd trafiksäkerhet och väderförhållanden spelar roll.

    Det är möjligt att vädrets påverkan för beslutsprocessen att cykla eller ej beror på vilken cyklist de handlar om. Det skulle till exempel kunna vara att det finns vissa grupper med mer hängivna cyklister som är benägna att cykla långt in på eller hela vintern, och att dessa påverkas huvudsakligen endast av extrema väderförhållanden, medan det kan vara så att föräldrar ställer in cykeln för barn vid viss tidpunkt på året när väderförhållanden blir sämre.

    Det finns fler anledningar varför det är viktigt att försöka öka vår förståelse av hur vädret påverkar exponeringen för cyklister:

    • Att öka cyklingen har flera positiva effekter för samhället. För att kunna uppnå det är det viktigt att ha förståelse för hur vädret påverkar cyklisterna
    • Trots att det är svårt att påverka väderförhållanden kan vi mildra effekten av dessa genom bättre förståelse av hur dessa påverkar cykel som färdmedelsval, genom till exempel bättre vinterväghållning.
    • Det pågår långsiktiga klimatförändringar. Detta skulle kunna påverka cykelexponeringen, särskild under hösten och våren. Genom bättre förståelse av dessa samband så kan vi möjligtvis dra nytta av väderförändringarna genom att stödja cyklingen under dessa perioder.
  • 32.
    Linder, Astrid
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Holmqvist, Kristian
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Svensson, Mats Y.
    Chalmers Tekniska Högskola.
    Average male and female virtual dummy model (BioRID and EvaRID) simulations with two seat concepts in the Euro NCAP low severity rear impact test configuration2017In: Accident Analysis and Prevention, ISSN 0001-4575, E-ISSN 1879-2057Article in journal (Refereed)
    Abstract [en]

    Soft tissue neck injuries, also referred to as whiplash injuries, which can lead to long term suffering accounts for more than 60% of the cost of all injuries leading to permanent medical impairment for the insurance companies, with respect to injuries sustained in vehicle crashes. These injuries are sustained in all impact directions, however they are most common in rear impacts. Injury statistics have since the mid-1960s consistently shown that females are subject to a higher risk of sustaining this type of injury than males, on average twice the risk of injury. Furthermore, some recently developed anti-whiplash systems have revealed they provide less protection for females than males. The protection of both males and females should be addresses equally when designing and evaluating vehicle safety systems to ensure maximum safety for everyone. This is currently not the case. The norm for crash test dummies representing humans in crash test laboratories is an average male. The female part of the population is not represented in tests performed by consumer information organisations such as NCAP or in regulatory tests due to the absence of a physical dummy representing an average female.

    Recently, the world first virtual model of an average female crash test dummy was developed. In this study, simulations were run with both this model and an average male dummy model, seated in a simplified model of a vehicle seat. The results of the simulations were compared to earlier published results from simulations run in the same test set-up with a vehicle concepts seat. The three crash pulse severities of the Euro NCAP low severity rear impact test were applied. The motion of the neck, head and upper torso were analysed in addition to the accelerations and the Neck Injury Criterion (NIC). Furthermore, the response of the virtual models was compared to the response of volunteers as well as the average male model, to that of the response of a physical dummy model. Simulations with the virtual male and female dummy models revealed differences in dynamic response related to the crash severity, as well as between the two dummies in the two different seat models. For the comparison of the response of the virtual models to the response of the volunteers and the physical dummy model, the peak angular motion of the first thoracic vertebra as found in the volunteer tests and mimicked by the physical dummy were not of the same magnitude in the virtual models.

    The results of the study highlight the need for an extended test matrix that includes an average female dummy model to evaluate the level of occupant protection different seats provide in vehicle crashes. This would provide developers with an additional tool to ensure that both male and female occupants receive satisfactory protection and promote seat concepts that provide the best possible protection for the whole adult population. This study shows that using the mathematical models available today can provide insights suitable for future testing.

  • 33.
    Linder, Astrid
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Holmqvist, Kristian
    Chalmers University of Technology, Sweden.
    Svensson, Mats Y.
    Chalmers University of Technology, Sweden.
    Simulations with average male and female dummy models with two seat concepts in the Euro NCAP low severity rear impact test configuration2016Conference paper (Refereed)
    Abstract [en]

    Soft tissue neck injuries, also referred to as whiplash injuries, which can lead to long term suffering are most common in rear impacts. These injuries account for more than 60% of the cost of all injuries leading to permanent medical impairment for the insurance companies with respect to injuries sustained in vehicle crashes. Injury statistics have since the mid-1960s consistently shown that females are subject to a higher risk of sustaining this type of injury than males, on average twice the risk of injury. Furthermore, recently developed anti-whiplash systems have shown to protect females less than males. The diversity of males and females should be addresses when designing and evaluating vehicle safety systems to ensure maximum safety for everyone. This is currently not the case. The norm for crash test dummies representing humans in crash test laboratories is an average male. The female part of the population is not represented in tests performed by consumer information organisations such as NCAP due to the absence of a physical dummy representing an average female. Recently, the world first virtual model of an average female crash test dummy was developed. In this study, simulations were run with both an average male, and the recently developed average female dummy model, seated in a laboratory vehicle seat. The results of the simulations were compared to earlier published results from the same test set-up with a vehicle concepts seat. The three crash pulse severities of the Euro NCAP low severity rear impact test were applied. The motion of the neck, head and upper torso were analysed in addition to the accelerations and the Neck Injury Criterion (NIC). Furthermore, the response of the virtual models was compared to that volunteers and for the average male model, to that of the response of a physical dummy model. Simulations with the male and the female dummy models revealed differences related to the crash severity, as well as between the two dummies in different crash severities in two different seats. For the comparison of the response of the virtual models to the response of the volunteers and the physical dummy model, the peak angular motion of first thoracic vertebra as found in the volunteer tests and mimicked by the physical dummy were not of the same magnitude in the virtual models.

  • 34.
    Linder, Astrid
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System. VTI.
    Silvano, Ary P.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Sörensen, Gunilla
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Pettersson, Tommy
    Swedish National Road and Transport Research Institute, Infrastructure, Crash safety. VTI.
    Stabilitet på cykel med och utan ABS: en pilotstudie2018Report (Other academic)
    Abstract [sv]

    Projektet, som är en pilotstudie, syftade till att undersöka effekten av låsningsfria bromsar, ABS, på cykel. Fråga som projektet syftade till att besvara: Kan cyklars stabilitet under inbromsning förbättras av låsningsfri broms (ABS) på framhjulet? Frågan söks besvaras genom utformning och genomförande av bromsprov av cykel med och utan ABS. Cykelolyckor är bland de vanligaste orsakerna till trafikskador i Sverige, ofta med svåra skador och medicinsk invaliditet som följd. Närmare hälften av alla svårare trafikskador har uppstått på grund av cykelolyckor. ABS-bromsar har visats reducera risken för skada för motorcyklister genom ökad stabilitet och därmed minskad risk för omkullkörning i samband med bromsning. Däremot finns begränsad kunskap om effekten för cyklister. Två Crescentcyklar med sluten ram (herrcykel) testades: en konventionell, bakhjulsdriven modell med v-broms (fäljbroms) på framhjulet och en framhjulsdriven modell med el-assistans och navbroms i framhjulet. Med den konventionella cykeln utfördes två typer av tester, med och utan ABS-bromsar. ABS-bromsen var av modellen SABS V1. På el-cykeln med navbroms justerades bromsverkan så att framhjulet ej låstes, jämfört med full bromsverkan. En Hybrid II krockdocka, 50-percentil man, användes som cyklist i proven. Proven utfördes vid hastigheterna 17 och 20 km/h. Cyklarna bromsades maximalt på framhjulet. Friktionen var ungefär 0,7–0,8. Resultaten visade att ABS på cykelns framhjul gör att framhjulet inte låses vid full inbromsning och bakhjulet behåller kontakten med underlaget. Vid prov med v-broms eller navbroms med full broms-verkan blev bromssträckan cirka 2 meter, men framhjulet låstes vid full broms och bakhjulet lyfte från underlaget. Det innebar att cykeln då endast balanserade på framhjulet. Prov med ABS-broms på v-bromsen och justerad bromsverkan på navbromsen resulterade däremot i inbromsning utan låsning av framhjulet. Bromssträckan var i dessa prov cirka 4 meter. Resultaten var liknande för de båda cyklarna.

  • 35.
    Linder, Astrid
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Svedberg, Wanna
    Swedish National Road and Transport Research Institute, Society, environment and transport, Environment.
    Occupant safety assessment in European regulatory tests: review of occupant models, gaps and suggestion for bridging any gaps2018Conference paper (Refereed)
    Abstract [en]

    There are two parts to the aim of this study. The first part was to review how adult men and women are represented in regulatory tests conducted to assess adult occupant safety in vehicles. Based on the results of the review an outline for how to better represent the adult population in regulatory tests was suggested. The second part of the aim, described as emancipatory knowledge of interest, included highlighting the values declared in the Treaty on European Union and the Treaty on the Functioning of the European Union (hereinafter referred as "the Treaties"). This means that the purpose of the knowledge is to recognize the legal values of equality between women and men, as well as non-discrimination on which the Union is founded, article 2 of the Treaty on European Union. as expressed in the above-mentioned Treaties. In addition to that to contribute to women's and men's liberation and to the development of society.

  • 36.
    Linder, Astrid
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Svedberg, Wanna
    Swedish National Road and Transport Research Institute, Society, environment and transport, Environment.
    Review of average sized male and female occupant models in European regulatory safety assessment tests and European laws: Gaps and bridging suggestions2019In: Accident Analysis and Prevention, ISSN 0001-4575, E-ISSN 1879-2057, Vol. 127, p. 156-162Article in journal (Refereed)
    Abstract [en]

    There are two parts to the aim of this study. The first part comprised reviewing how men and women are represented in regulatory tests conducted to assess adult occupant safety in vehicles in Europe. This part also contains an overview of some differences between females and males that may influence dynamic responses in a crash. Based on the results of the review an outline for how to better represent the adult population in regulatory tests has been suggested. The second part was to reflect on these issues from a specific critical legal perspective, that is from a Gender Legal Studies point of view, focusing on the European legal framework that governs the tests of adult occupant safety in vehicles in Europe. Since the beginning of the 1970s legal scholars have shown in several areas of law that there is a gap between superior legislation and practice, but also between gender equality as a superior legal principle and subordinate legal rules that govern safety requirements. The same pattern can be discerned in the area of Transportation Law.

    The results of the review of the ECE regulations shows that the average sized male represents the adult population and that the average sized female has been excluded from regulations assessing the protection of adult vehicle occupants. The fundamental values, on which the Union is founded, including the overarching goals of the Union, seem to be rendered invisible in the laws and critically impact the safety of women in everyday life. According to the gender system theory, the interests and priorities of men are continuing to shape the law. Consequently, the law neglecting the safety of women on roads has implications on the development of society. The lack of legal provisions that demand female crash test dummies representing the female part of the population, means that there is no incentive for car manufacturers, authorities or other stakeholders to develop test methods and female crash test dummies in ways that promote political objectives expressed in legal form, i.e., the legal values expressed in general provisions and principles stated in the Treaty on European Union and the Treaty on the Functioning of the European Union, such as gender equality between women and men as well as non-discrimination This study highlights the undeniable gap between the legal framework and legal requirements with regard to occupant safety for the whole adult population. It would be attainable to bridge this particular gender gap by providing equal representation for the female part of the population with regard to vehicle safety, as that males benefit from.

  • 37.
    Linder, Astrid
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Svensson, Mats Y.
    Chalmers Tekniska Högskola.
    Road safety: the average male as a norm in vehicle occupant crash safety assessment2019In: ISR. Interdisciplinary science review, ISSN 0308-0188, E-ISSN 1743-2790, Vol. 44, no 2, p. 140-153Article in journal (Refereed)
    Abstract [en]

    This review addresses how women and men are represented in regulatory tests conducted to assess adult occupant safety in vehicles. Injury statistics show that protection in the event of a crash is lower for females than males. Still, vehicle crash safety assessment for adult occupants is only using the average sized male to represent the entire adult population, while the average sized female is not represented. In order to enable car manufacturers and road safety regulators to safeguard that females benefit equally from crash safety measures as males, it is necessary to develop new dedicated occupant models. These new models must represent the female part of the population, i.e. crash test dummies and human body models representing the average female. New female models would, together with their male equivalents, make it possible to identify the vehicle occupant safety systems which provide the best safety features for both females and males.

  • 38.
    Linder, Astrid
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Sörensen, Gunilla
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Silvano, Ary P.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Anti-lock Braking System on Bicycles: A pilot study on influence on stability2018In: Conference proceedings International Research Council on the Biomechanics of Injury, IRCOBI, International Research Council on the Biomechanics of Injury , 2018, p. 47-48Conference paper (Refereed)
  • 39.
    Liu, Zhuofan
    et al.
    Xi'an University of Posts & Telecommunications, China.
    Ahlström, Christer
    Swedish National Road and Transport Research Institute, Traffic and road users, Human Factors in the Transport System.
    Forsman, Åsa
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Kircher, Katja
    Swedish National Road and Transport Research Institute, Traffic and road users, Human Factors in the Transport System.
    Attentional Demand as a Function of Contextual Factors in Different Traffic Scenarios2019In: Human Factors, ISSN 0018-7208, E-ISSN 1547-8181, article id UNSP 0018720819869099Article in journal (Refereed)
    Abstract [en]

    Objective: To assess the attentional demand of different contextual factors in driving.

    Background: The attentional demand on the driver varies with the situation. One approach for estimating the attentional demand, via spare capacity, is to use visual occlusion.

    Method: Using a 3 × 5 within-subjects design, 33 participants drove in a fixed-base simulator in three scenarios (i.e., urban, rural, and motorway), combined with five fixed occlusion durations (1.0, 1.4, 1.8, 2.2, and 2.6 s). By pressing a microswitch on a finger, the driver initiated each occlusion, which lasted for the same predetermined duration within each trial. Drivers were instructed to occlude their vision as often as possible while still driving safely.

    Results: Stepwise logistic regression per scenario indicated that the occlusion predictors varied with scenario. In the urban environment, infrastructure-related variables had the biggest influence, whereas the distance to oncoming traffic played a major role on the rural road. On the motorway, occlusion duration and time since the last occlusion were the main determinants.

    Conclusion: Spare capacity is dependent on the scenario, selected speed, and individual factors. This is important for developing workload managers, infrastructural design, and aspects related to transfer of control in automated driving.

    Application: Better knowledge of the determinants of spare capacity in the road environment can help improve workload managers, thereby contributing to more efficient and safer interaction with additional tasks.

  • 40.
    Niska, Anna
    et al.
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance. VTI.
    Eriksson, Jenny
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Taavo, Ellen
    Stockholms stad.
    Sopsaltningens effekt på cykeltrafiken: en analys av cykelflöden och olyckor i Stockholm2019Report (Other academic)
    Abstract [en]

    A winter maintenance method for cycleways becoming widespread in Sweden is “sweep-salting”. The method entails a front-mounted power broom for snow clearance and brine, pre-wetted or dry salt for de-icing. Traditionally in Sweden, ploughing and gritting is used for winter maintenance of cycleways and footways. At VTI the sweep-salting method has been evaluated in several research studies, focusing on the method, equipment and strategies in order to give recommendations regarding the implementation of the method. In the study presented in this report, this research has been complemented with analysis of accident data from Strada, from 2013 through 2017 and the winter seasons 2012/13–2017/18, including cyclists, pedestrians and moped riders as well as cycle flow measurements from Stockholm, with the objective to evaluate the effects of sweep-salting on cyclists.

    All in all, our analyses of bicycle flow measurements from Stockholm show that sweep-salting contributed to increase the winter cycling. The analyses of accident data indicate that sweep-salting has also contributed to reduce the number of accidents due to skidding. Since the sweep-salted cycle routes are generally important for commuting resulting in relatively high cycle flows, it is likely that the accident risk per cyclist is lower after sweep-salting has been introduced. However, the available data was not extensive enough to quantify the effects. Nevertheless, it is clear that sweep-salting has not led to an increased accident risk. Fall accidents among pedestrians represent the major part of the accidents due to skidding and they occurred mainly on sidewalks in the inner city. We have also analysed weather data from VViS stations located along the road network around Stockholm and from one of SMHI's weather stations in Stockholm.

  • 41.
    Niska, Anna
    et al.
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Henriksson, Malin
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Anund, Anna
    Swedish National Road and Transport Research Institute, Traffic and road users, Human Factors in the Transport System.
    Eriksson, Jenny
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Ihlström, Jonas
    Swedish National Road and Transport Research Institute, Traffic and road users, Human Factors in the Transport System.
    Svedberg, Wanna
    Swedish National Road and Transport Research Institute, Society, environment and transport, Environment.
    Wallén Warner, Henriette
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Wehtje, Philip
    Swedish National Road and Transport Research Institute, Society, environment and transport, Transport economics.
    Cykling bland barn och unga: en kunskapssammanställning2017Report (Other academic)
    Abstract [en]

    Cycling among children and young adults has decreased, resulting in negative effects on their health and independent mobility. The Swedish government has commissioned VTI to review and compile knowledge on plausible reasons, based on literature reviews, contacts with relevant players and analyses of travel surveys and accident statistics. The statistics showed that the number of individuals who cycle has decreased, whereas the cycled distance remains unchanged. Above all, recreational cycling among children and young adults has decreased, which could be explained by longer distances to recreational activities, more parents working full-time and children’s everyday lives having become more institutionalised. Cycling to school has also decreased. Among other things, families being able to choose what school the children attend has resulted in greater distances between the home and the school. Other reasons include households owning more cars, changes in the way children play and communicate, and inadequate actual and perceived safety conditions along cycle lanes combined with parents’ perceptions of their children’s highway skills. Cycling has been partially replaced by car journeys, but mainly by walking and use of public transport. Cycling has decreased the most among older children. As they have primarily replaced cycling by public transport, one explanation could be that more of them are offered free bus passes. There is a great commitment and competency among various players regarding cycling among children and young adults. However, there is a great need for better coordination and for actions and measures taken to be systematically evaluated.

  • 42.
    Ohlin, Maria
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Alguren, Beatrix
    Göteborgs Universitet.
    Lie, Anders
    Chalmers Tekniska Högskola.
    Analysis of bicycle crashes in Sweden involving injuries with high risk of health loss2019In: Traffic Injury Prevention, ISSN 1538-9588, E-ISSN 1538-957X, Vol. 10, no 1Article in journal (Refereed)
    Abstract [en]

    Objective: The objectives of the present article were to (a) describe the main characteristics of bicycle crashes with regard to the road environment, crash opponent, cyclist, and crash dynamics; (b) compare individuals who describe their health after the crash as declined with those who describe their health as not affected; and (c) compare the number of injured cyclists who describe their health as declined after the crash with the predicted number of permanent medical impairments within the same population.

    Methods: A sample of individuals with specific injury diagnoses was drawn from the Swedish Traffic Accident Data Acquisition (STRADA) database (n = 2,678). A survey form was used to collect additional information about the crash and the health-related outcomes. The predicted number of impaired individuals was calculated by accumulating the risk for all individuals to sustain at least a 1% permanent medical impairment, based on the injured body region and injury severity.

    Results: Nine hundred forty-seven individuals (36%) responded, of whom 44% reported declined health after the crash. The majority (68%) were injured in single bicycle crashes, 17% in collisions with motor vehicles, and 11% in collisions with another cyclist or pedestrian. Most single bicycle crashes related to loss of control (46%), mainly due to skidding on winter surface conditions (14%), followed by loss of control during braking (6%). There was no significant difference in crash distribution comparing all crashes with crashes among people with declined health. The predicted number of impaired individuals (n = 427) corresponded well with the number of individuals self-reporting declined health (n = 421).

    Conclusions: The types of crashes leading to health loss do not substantially differ from those that do not result in health loss. Two thirds of injuries leading to health loss occur in single bicycle crashes. In addition to separating cyclists from motorized traffic, other preventive strategies are needed.

  • 43.
    Patten, Christopher
    et al.
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Wallén Warner, Henriette
    Swedish National Road and Transport Research Institute, Society, environment and transport, Mobility, actors and planning processes.
    Sörensen, Gunilla
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Hjulburna oskyddade trafikanter på landsväg2017Report (Other academic)
    Abstract [en]

    The background to this collection of three sub-studies; 1) Two-minus-one bicycle lanes on rural roads, 2) How close is close? and 3) Pilot study on road friction testing for motorcycles, is to highlight any problems that two-wheeled unprotected road users have on Swedish roads. Studies 1 and 2 are about cyclists on country roads, while study 3 is about motorcyclists. Study 1 is a survey of a new road design, two-minus-one rural roads. Study 2 is an experimental study that highlights the issue of the width of a cycle path/hard-shoulder from the perspective of the cyclist. Study 3 is friction measurements carried out on a measurement method that is more adapted to the situation of motorcyclists. The three sub-studies resulted in the following recommendations: i) stretches of rural roads that are intended to be two-minus-one rural roads should be chosen carefully and in places where sight-lines are obscured (by hedgerows, topography, etc.), alternative solutions should be considered. ii) The speed limitation on the two-minus-one rural roads should not exceed 50 km/h. In order to reduce speeding, signage in combination with surveillance and/or infrastructure measures should be considered to reduce speed violations. iii) The introduction of two-minus-one rural roads should be done in dialogue with local populations and preceded by information efforts so that everyone knows what rules apply. iv) A single carriageway cycle path/hard-shoulder on a two-minus-one rural road with mixed traffic should be at least 120 cm laterally from the middle of the bicycle path to the motor vehicles’ carriageway. v) Friction measurements should be linked to the driver's experience of grip. vi) Develops a measurement method/protocol for friction testing where the measurement section is ≥ 1 m in different levels of wetness on the roadway, which can also be used to evaluate blackspots on road sections that are linked to “temporary” road repairs.

  • 44.
    Putra, I. Putu A.
    et al.
    Chalmers University of Technology.
    Iraeus, Johan
    Chalmers University of Technology.
    Thomson, Robert
    Chalmers University of Technology.
    Svensson, Mats Y.
    Chalmers University of Technology.
    Linder, Astrid
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System. Chalmers University of Technology.
    Sato, Fusako
    Chalmers University of Technology.
    Comparison of control strategies for the cervical muscles of an average female head-neck finite element model2019In: Traffic Injury Prevention, ISSN 1538-9588, E-ISSN 1538-957XArticle in journal (Refereed)
    Abstract [en]

    Objective: ViVA OpenHBM is the first open source Human Body Model (HBM) for crash safety assessment. It represents an average size (50th percentile) female and was created to assess whiplash protection systems in a car. To increase the biofidelity of the current model, further enhancements are being made by implementing muscle reflex response capabilities as cervical muscles alter the head and neck kinematics of the occupant during low-speed rear crashes. The objective of this study was to assess how different neck muscle activation control strategies affect head-neck kinematics in low speed rear impacts.

    Methods: The VIVA OpenHBM head-neck model, previously validated to PMHS data, was used for this study. To represent the 34 cervical muscles, 129 beam elements with Hill-type material models were used. Two different muscle activation control strategies were implemented: a control strategy to mimic neural feedback from the vestibular system and a control strategy to represent displacement feedback from muscle spindles. To identify control gain values for these controller strategies, parameter calibrations were conducted using optimization. The objective of these optimizations was to match the head linear and angular displacements measured in volunteer tests.

    Results: Muscle activation changed the head kinematics by reducing the peak linear displacements, as compared to the model without muscle activation. For the muscle activation model mimicking the human vestibular system, a good agreement was observed for the horizontal head translation. However, in the vertical direction there was a discrepancy of head kinematic response caused by buckling of the cervical spine. In the model with a control strategy that represents muscle spindle feedback, improvements in translational head kinematics were observed and less cervical spine buckling was observed. Although, the overall kinematic responses were better in the first strategy.

    Conclusions: Both muscle control strategies improved the head kinematics compared to the passive model and comparable to the volunteer kinematics responses with overall better agreement achieved by the model with active muscles mimicking the human vestibular system.

  • 45.
    Sato, Fusako
    et al.
    Japan Automobile Research Institute.
    Brolin, Karin
    Chalmers Tekniska Högskola.
    Svensson, Mats
    Chalmers Tekniska Högskola.
    Linder, Astrid
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Towards occupant protections for both men and women2020In: Advances in Intelligent Systems and Computing, Springer Verlag , 2020, Vol. 975, p. 603-615Conference paper (Refereed)
    Abstract [en]

    The susceptibility of female occupants to Whiplash Associated Disorders (WADs) has been the focus over the past decades. To improve occupant protections, it is required to understand how gender differences affect the WAD injury mechanisms. The purpose of this study is to investigate the potential impact of the whole spinal alignment on the cervical vertebral kinematics and ligament elongation during a rear impact by analysing rear impact reconstruction simulations. The simulations demonstrated a potential impact of gender differences in whole spinal alignment on cervical vertebral kinematics and ligament elongations. It seems that the average female spinal alignment may expose women to larger deformation of the cervical soft tissues considered related to WAD, due to greater cervical vertebral kinematics, compared to the average male spinal alignment. The findings highlight the importance of the whole spinal alignment when developing female models to evaluate WAD countermeasures, and may thus improve occupant protection for women as well as men.

  • 46.
    Silvano, Ary P.
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Linder, Astrid
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Traffic safety for cyclists in roundabouts: geometry, traffic, and priority rules: A literature review2017Report (Other academic)
    Abstract [en]

    The aim of this study was to carry out a literature review of roundabout geometric characteristics and traffic management regulations addressing the safety for cyclists. The literature review examined articles from 1990 until 2017. An article was considered relevant as follows:

    • Investigation of the relationship between roundabout geometric design and cyclist accidents (2 articles)
    • Investigation of the relationship between roundabout geometric design and cyclist operation/interaction with other traffic, i.e., motorised vehicles (4 articles)
    • Investigation of any safety impacts of the conversion of intersections into roundabouts for cyclists (9 articles)
    • Psychological/behavioural studies of cycling at roundabouts (5 articles)

    The results show that the impact on cyclist safety is not as clear as for motorised vehicles with some studies showing a deterioration for cyclists (Jensen, 2013; 2016; Daniels et al. 2008; 2009). The cycle facility type (e.g., mixed traffic, cycle lane, and cycle path) and the priority rules have the potential to increase safety for cyclists. For example, the priority rules vary among different countries and within some countries.

    From the literature, which priority rules provide the safest cycling environment remain unclear in terms of number of accidents and injury severity. The identified priority strategies are: (i) cyclists always yield to vehicles, (ii) shared yielding responsibility, (iii) vehicles always yield to cyclists, and (iv) an alternate solution ‘with’ and ‘without’ priority based on special characteristics (e.g., presence of vulnerable road users, geographic location). Furthermore, cycle lanes are the most unsafe cycle facility compared to mixed traffic or cycle paths. Likewise, coloured cycle lanes at roundabouts are less safe than non-coloured cycle lanes (Jensen, 2016). On the other hand, it is recommended that cyclists should ride in front of or behind vehicles in mixed traffic at single-lane roundabouts and in the middle of the lane, and should not ride parallel with vehicles (Cumming, 2012).

    Some research directions are highlighted. The impact of the different priority rules needs further investigation in terms of number of accidents and injury severity. Some questions to study include: (i) what the best priority strategy is; (ii) what special road markings should be used; (iii) what the best distance is to place the cycle path from the circulatory roadway. Another research direction is to establish the impact on cyclist safety of cycle lanes at roundabouts. Finally, the impact on traffic safety, by cycling in the middle of the lane, needs further investigation as well.

  • 47.
    Silvano, Ary P.
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Ohlin, Maria
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Non-collision incidents on buses due to acceleration and braking manoeuvres leading to falling events among standing passengers2019In: Journal of Transport and Health, ISSN 2214-1405, E-ISSN 2214-1405, Vol. 14, article id 100560Article in journal (Refereed)
    Abstract [en]

    Background: On public transport buses, standing passengers are subject to acceleration and braking driver manoeuvres which may lead to a falling event. Purpose and procedures: This study investigates the characteristics of such events connected to driver manoeuvres (i.e., acceleration or braking), passenger conditions (i.e., boarding, travelling, alighting), and injury severity. The data for analyses comprise three and a half years (2015–2018). All passengers were standing at the time of the fall event and were treated at hospital emergency departments (ED) after the falling event. Findings: The results highlight aspects which may need further attention. For example, the involvement of females is not only high for the 65 ​+ ​age group, this is also the case for younger age groups which indicates that acceleration/deceleration threshold values for sustaining balance may differ by gender. Furthermore, driver manoeuvres and passenger conditions are important characteristics impacting the mechanisms of falling differently. In acceleration manoeuvres, older passengers (aged 65+) are most often involved in a fall inmediately after boarding, whereas falls during braking manoeuvres are most common while travelling, and mostly involving the 25-64 years-old age group. Conclusions: These findings may indicate that acceleration and braking manoeuvres should be studied separately. It is worth noting that driving style might influence the risk of losing balance for standing passengers, and shortening the time to get seated can be beneficial for reducing the risk of falling, especially for the elderly users after boarding the bus.

  • 48.
    Silvano, Ary P.
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Olstam, Johan
    Swedish National Road and Transport Research Institute, Society, environment and transport, Traffic analysis and logistics.
    Singh, Amritpal
    Viscando.
    Bolbat, Mikhail
    Viscando.
    Frånfartskapacitet i cirkulationsplatser: effekter av korsande gång- och cykelflöden2019Report (Other academic)
    Abstract [en]

    In the evaluation of capacity and level of service at intersections, there is a need to investigate the impact of pedestrians and cyclists flows on vehicle traffic and vice versa. This is especially important at roundabouts, as vehicles that turn right to exit the roundabout must give way ‘yield’ to crossing pedestrians and bicycles, which sometimes creates queue spillbacks of vehicles into the circulating roadway. The current capacity calculation method in the Swedish Transport Administration "capacity manual" (TRVMB) does not take into account such impact and considers pedestrians and cyclists traffic crossing only at the approaching lanes at roundabouts.

    This report presents a study with the purpose of identifying and investigating methods that can take into account capacity reduction effects of crossing pedestrians and cyclists flows at roundabouts. This is in order to bridge the shortcomings that exist in the current method. It is important that interactions between drivers and other road users are included in the chosen method. The method(s) that are interesting to study further are the methods that can take into account crossing pedestrians and cyclists traffic in approaching and exiting lanes at roundabouts. In addition, the chosen method must consider different yielding behavior for vehicles, pedestrian and bicycle traffic. Critical time gap based methods have difficulties when pedestrians and cyclists traffic is taken into account in the model because of varying compliance with priority rules.

    The literature study resulted in four potential methods for modelling the effects of crossing pedestrians and cyclists on exiting lanes at roundabouts. One of the methods (Wu 2001) has been applied for both Japanese conditions (Kang and Nakamura 2014, Kang, Nakamura et al. 2014) and German conditions (Wu and Brilon 2017, Wu and Brilon 2018). Of these two applications of Wu’s theory, the application of Wu and Brilon (the so-called conflict technique) is the most promising and appropriate regarding the shortcomings of the current method in Capcal.

  • 49.
    Silvano, Ary P.
    et al.
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Vadeby, Anna
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Forsman, Åsa
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    A pilot study aiming to increase speed compliance of taxi drivers in Sweden2018Conference paper (Refereed)
    Abstract [en]

    Speed is one of the most key factor that increases the accident risk and injury severity (Nilsson, 2004). Therefore, speed limits are set to guide to choose the right speed based on the road environment. However, compliance level is in general low which means that many drivers choose to drive faster than the speed limit when traffic condition is not congested. Mannering (2009) points out that there is a general disrespect to keep speed limits worldwide. An increase in the compliance level of taxi drivers could potentially influence the chosen speed of other drivers on the roads. It is therefore important to study and quantify compliance level of taxi drivers.

    Public authorities (e.g., police, road administration offices) aim to enforce speed compliance levels on public roads. Speed enforcement campaigns can include police speed control interventions, speed camera surveillance, education campaigns. As a part of this pilot study, police officers plan to meet taxi company representatives to discuss current speed compliance levels an agree on new approaches which can increase compliance levels of taxi drivers

    The aim of the study is thus to investigate a new method aiming to increase speed compliance of taxi drivers involving an agreement between the police and taxi representatives.

  • 50.
    Skyving, Marie
    et al.
    Transportstyrelsen.
    Forsman, Åsa
    Swedish National Road and Transport Research Institute, Traffic and road users, Traffic Safety and Traffic System.
    Dukic Willstrand, Tania
    Swedish National Road and Transport Research Institute, Traffic and road users, Human Factors in the Transport System.
    Samband mellan sjukdomar och äldre bilförares inblandning i trafikolyckor2018Report (Other academic)
    Abstract [sv]

    Sverige är ett av få länder inom EU som inte har obligatoriska hälsokontroller för förare över en viss ålder. Vår motivering är att man inte kunnat påvisa positiva trafiksäkerhetseffekter av sådana kontroller. Den här studien utreder om personbilsförare som är 65 år eller äldre och som har en sjukdomsdiagnos oftare är inblandade i trafikolyckor jämfört med förare i samma ålder och utan diagnos. 

    Forskningsstudien har sin utgångspunkt i de trafikmedicinska föreskrifterna och de 13 diagnosgrupperna som beskrivs i föreskrifternas olika kapitel. För att undersöka om äldre bilförare med en sjukdomsdiagnos har högre olycksrisk än äldre bilförare utan diagnos har vi matchat en fallpopulation på 13 700 olycksinblandade förare som var 65 år eller äldre med en kontrollgrupp. Kontrollgruppen bestod av 26 500 åldersmatchade personer som skulle uppfylla tre krav: ha giltigt B-körkort (personbil), vara bilägare och inte ha varit inblandade i någon trafikolycka. 

    De register som vi använt oss av är 

     Transportstyrelsens olycksdatabas Strada

     Statistiska centralbyråns befolkningsregister

     Socialstyrelsens patientregister.

    Studien begränsas av ett antal faktorer, till exempel att vi saknar uppgift om exponering i trafik och föreskrivna läkemedel, för att nämna några. Det här innebär bland annat att vi inte kan säga om en t. ex. förhöjd sannolikhet för olycka beror på försämrad körförmåga eller att man kör mer bil och att man därmed är mer exponerad i trafiken. 

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