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Liu, C., Tapani, A., Kristoffersson, I., Rydergren, C. & Jonsson, D. (2019). En transportmodell med fokus på cykeltrafik: modellutveckling och scenarioanalyser. Linköping: Statens väg- och transportforskningsinstitut
Open this publication in new window or tab >>En transportmodell med fokus på cykeltrafik: modellutveckling och scenarioanalyser
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2019 (Swedish)Report (Other academic)
Alternative title[en]
A transport model with focus on bicycle trips : model development and scenario analysis
Abstract [sv]

Ökad andel resor med hållbara färdmedel är en förutsättning för att kombinera fortsatt tillväxt med minskad resursförbrukning och miljöpåverkan. I många europeiska städer har cykel blivit ett alltmer populärt färdmedel under de senaste decennierna. Dagens storskaliga transportmodeller, som utgör viktiga verktyg för utvärderingar och samhällsekonomiska analyser, är dock oftast fokuserade på modellering av resor med bil eller kollektivtrafik. Den här rapporten presenterar en tur-baserad transportmodell med syfte att bättre modellera cykelresor. Nyheterna i denna modell är bland annat ett detaljerat cykelnät som innehåller mer än 200 000 länkar och att modellen nyttjar en mer detaljerad zonindelning. Jämfört med nuvarande verktyget för samhällsekonomisk analys av cykelåtgärder, GCkalk, beskriver modellen ett fullständigt utbud och efterfrågan för cykel på detaljerad geografisk nivå. Modellen har skattats på data från den senaste resvaneundersökningen i Stockholms län från 2015 och representerar därmed observerat resebeteende. Modellen beaktar även cykel som anslutningsfärdmedel till resor med kollektivtrafik. Därigenom behandlar modellen cykel- och kollektivtrafik både som konkurrerande och som komplementära färdmedel och modellen kan utvärdera effekten av en förbättring av cykelinfrastrukturen på både enbart cykelresande och på cykel som anslutningsfärdmedel till kollektivtrafikstationer. Modellen är validerad mot cykelräkningar i Stockholm stad från september och oktober 2015. Modellen har testats på sex scenarier valda från Stockholms stads investeringsplan. Resultaten visar att investeringarna har en begränsad effekt på överflyttning mellan färdmedel och en måttlig effekt på befintliga cyklisters ruttval, restid och generaliserad kostnad.

Abstract [en]

Encouraging the use of active travel modes such as walking and cycling is vital for ensuring a sustainable urban development. In many European metropolitan areas, cycling is becoming increasingly popular within the recent decades. On the other hand, large-scale transport models, which serve as the main tools for policy evaluation and cost-benefit analysis, are often designed for modelling motorised travel modes such as private car and public transport. This study presents a tourbased transport model to better model cycling demand and supply. First, it uses a detailed bicycle network containing more than 200,000 links, covering the whole Greater Stockholm Area. Second, the model utilizes a refined zoning system with totally 5 808 zones each of the size of 250 m×250 m covering the entire Greater Stockholm Area. Third, the model is estimated on the newest Stockholm travel survey 2015, and therefore the model can represent travel behaviour that is up-to-date. In addition to the improvements mentioned above, the model also considers cycling as an access travel mode to a trip by public transport. Therefore, the model treats cycling and public transport as both competing and complementary modes, and the model is capable of evaluating the impact of an improvement in bicycle infrastructure on cycling, as well as on cycling to public transport stations. The model is then validated against bicycle count data from the City of Stockholm. Six scenarios are tested according to the investment plan from the City of Stockholm. The results show that the investments have a limited effect on modal shift but a moderate effect on the existing cyclists' route choice, travel time and generalised cost.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2019. p. 144
Series
VTI rapport, ISSN 0347-6030 ; 1007
Keywords
Bicycle, Cycling, Journey, Forecast, Model (not math), Calculation
National Category
Transport Systems and Logistics
Research subject
10 Road: Transport, society, policy and planning, 113 Road: Cycling, walking and moped transport
Identifiers
urn:nbn:se:vti:diva-13706 (URN)
Available from: 2019-04-18 Created: 2019-04-18 Last updated: 2019-06-11Bibliographically approved
Grumert, E., Bernhardsson, V., Ekström, J., Gundlegård, D., Ringdahl, R. & Tapani, A. (2019). Variabla hastighetsgränser för Stockholms motorvägsnät: effekter av alternativa algoritmer och möjligheter till styrning genom estimerade trafiktillstånd. Linköping: Statens väg- och transportforskningsinstitut
Open this publication in new window or tab >>Variabla hastighetsgränser för Stockholms motorvägsnät: effekter av alternativa algoritmer och möjligheter till styrning genom estimerade trafiktillstånd
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2019 (Swedish)Report (Other academic)
Alternative title[en]
Variable speed limits for Stockholm’s urban motorways : effects of different algorithms and the possibility to control by the use of estimated traffic states.
Abstract [sv]

Variabla hastighetsgränser är väl utbrett på Stockholms stadsnära motorvägar och en del av Stockholms Motorway Control System (MCS). Målet med dagens system är att minska risken för olyckor och följdolyckor vid låga hastigheter, trafikstockningar m.m. Detta görs genom att mäta medelhastigheten med hjälp av fasta detektorer och uppdatera hastigheten som visas på variabla meddelandeskyltar utifrån rådande trafiktillstånd. I och med att efterfrågan på resor i Stockholm under rusningstid överstiger den tillgängliga kapaciteten i vägnätet är behovet av ett effektivt trafiksystem stort. Variabla hastighetsgränser kan bidra till ökad framkomlighet, men då dagens system har som målsättning att öka säkerheten är effekter som leder till ökad framkomlighet begränsade. Dessutom finns det i dagens system ett stort beroende av fungerande detektorer som mäter trafiktillståndet så korrekt som möjligt för att valet av hastighet ska kunna bestämmas på ett effektivt sätt.

Syftet med den här rapporten är att undersöka alternativa styralgoritmer för att bestämma variabla hastighetsgränser på Stockholms motorvägsnät. Målet är att öka framkomligheten jämfört med dagens system. Två olika sträckor med olika komplexitet, trafiksituation och problematik studeras. Valet av studerade styralgoritmer för de olika sträckorna väljs för att på bästa sätt motverka den problematiken som uppstår på de specifika sträckorna. Därmed kan val av algoritmer komma att skilja sig åt beroende på sträcka. I projektet utvärderas också om estimering av trafiktillståndet kan användas för att förbättra informationsflödet till algoritmerna då detektorer inte fungerar som de ska eller helt saknas, vilket i sin tur kan leda till förbättrad anpassning av de variabla hastighetsgränserna. Detta görs av för en av de studerade sträckorna. Styralgoritmerna utvärderas med mikroskopisk trafiksimulering och metoden utvecklad i projektet Mobile Millenium Stockholm (MMS), som bygger på en makroskopisk trafikflödesmodell och Kalman filtrering, används för estimering av trafiktillståndet.

Abstract [en]

Variable speed limits are commonly used on Stockholm’s urban motorways, and it is part of the Stockholm Motorway Control System (MCS). The goal of today’s system is to reduce the risk of accidents during congested conditions, traffic jams etc. This is done by updating the speed limits shown on variable message signs based on a measured average speed at fixed detectors. As the demand for travel in Stockholm during peak-hours exceeds the available capacity in the road network, the need for an efficient traffic system is high. Variable speed limit systems have the possibility to contribute to increased efficiency, but since today’s system aims to increase safety, effects that lead to increased efficiency are limited. Further, in todays’ variable speed limit systems there are a large dependency of precise and available measurements from stationary detectors to be able to display speed limits that reflects the current traffic conditions. The purpose of this report is to investigate alternative control algorithms to decide on the variable speed limits to be displayed at variable message signs on the urban motorway of Stockholm.

The goal is to increase efficiency compared to today's system. Two different road stretches with different complexity and different traffic conditions, resulting in two different types of congestion, are studied. Thereby, the studied control algorithms on the two road stretches are chosen based on the possibility of solving a specific problematic traffic situation in the best way. Hence, the studied control algorithms might differ for the two road stretches. Furthermore, for one of the roads stretches it is investigated if estimation of the traffic state can be used as input to the control algorithm as a complement to missing and erogenous measurements from stationary detectors in order to improve the calculations of the variable speed limits. The control algorithms are evaluated with microscopic traffic simulation and the method developed in the project Mobile Millenium Stockholm (MMS), using a macroscopic traffic flow model together with a Kalman filter, is used for estimation of the traffic state.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2019. p. 52
Series
VTI rapport, ISSN 0347-6030 ; 1006
Keywords
Variable speed limit, Algorithm, Traffic flow, Traffic, Simulation, Micro, Macro, Motorway, Traffic control
National Category
Transport Systems and Logistics
Research subject
20 Road: Traffic engineering, 25 Road: Traffic theory
Identifiers
urn:nbn:se:vti:diva-13704 (URN)
Available from: 2019-04-08 Created: 2019-04-08 Last updated: 2019-06-11Bibliographically approved
Lindberg, T., Peterson, A. & Tapani, A. (2018). A simulation model for assessment and evaluation of bus terminal design. In: : . Paper presented at Conference on Advanced Systems in Public Transport and TransitData 2018.
Open this publication in new window or tab >>A simulation model for assessment and evaluation of bus terminal design
2018 (English)Conference paper, Published paper (Other academic)
Abstract [en]

Interchange stations with their connections between modes and lines are central for a high quality public transport system. Bus access at the station needs to operate reliably and efficiently in order to prevent congestion and queues. Here, a discrete event simulation model of vehicle movements and interactions at bus terminals is developed and implemented. The model has a modular approach, where common spatial sections at terminals are represented by modules that can be combined into various terminal layouts. These modules describe the events a vehicle may go through in a particular section of the terminal, such as arriving to a bus stop or stopping at a traffic light at the exit. The model can be used in planning processes, both for new terminals and redesign of existing ones, and is able to describe the detailed movements and interactions between vehicles that occur at larger terminals. The model is tested in a numerical experiment representing Norrköping interchange station in Sweden. The experiment shows that the model is able to evaluate and compare different scenarios and can thus be a useful tool in planning processes.

 

Keywords
Interchange (public transport), Simulation, Bus, Accessibility, Mathematical model, Evaluation (assessment)
National Category
Transport Systems and Logistics
Research subject
10 Road: Transport, society, policy and planning, 111 Road: Public transport; 20 Road: Traffic engineering, 25 Road: Traffic theory
Identifiers
urn:nbn:se:vti:diva-13985 (URN)
Conference
Conference on Advanced Systems in Public Transport and TransitData 2018
Available from: 2019-06-25 Created: 2019-06-25 Last updated: 2019-06-27Bibliographically approved
Grumert, E. & Tapani, A. (2018). Bottleneck mitigation through a variable speed limit system using connected vehicles. Transportmetrica A: Transport Science
Open this publication in new window or tab >>Bottleneck mitigation through a variable speed limit system using connected vehicles
2018 (English)In: Transportmetrica A: Transport Science, ISSN 2324-9935Article in journal (Refereed) Published
Abstract [en]

Variable speed limit (VSL) systems are used to improve the traffic conditions by adjusting the speed limits based on the current traffic situation. Advances in vehicle technology have made it possible to use connected vehicles in VSL systems. Connected vehicles can continuously transmit information about their speed and location, which can be used to estimate the current traffic conditions at arbitrary locations. In this study, we propose a VSL system based on connected vehicles. The aim is to also allow application of VSLs for non-recurrent bottleneck mitigation at arbitrary locations, unlike today's systems which require densely placed detectors or are limited to beforehand known bottleneck locations. The proposed system is evaluated by microscopic traffic simulation. The results indicate that the VSL system manage to improve traffic efficiency in a simulated incident scenario.

Place, publisher, year, edition, pages
Taylor and Francis Ltd., 2018
Keywords
Connected vehicle, Variable speed limit, Bottleneck, Evaluation (assessment), Simulation, Micro
National Category
Infrastructure Engineering
Research subject
20 Road: Traffic engineering, 22 Road: Traffic control and traffic information
Identifiers
urn:nbn:se:vti:diva-13453 (URN)10.1080/23249935.2018.1547332 (DOI)2-s2.0-85057525365 (Scopus ID)
Available from: 2018-12-28 Created: 2018-12-28 Last updated: 2019-03-14Bibliographically approved
Grumert, E., Tapani, A. & Ma, X. (2018). Characteristics of variable speed limit systems. European Transport Research Review, 10(2), Article ID 21.
Open this publication in new window or tab >>Characteristics of variable speed limit systems
2018 (English)In: European Transport Research Review, ISSN 1867-0717, E-ISSN 1866-8887, Vol. 10, no 2, article id 21Article in journal (Refereed) Published
Abstract [en]

The control algorithm used for deciding on the speed limit in variable speed limit systems is crucial for the performance of the systems. The algorithm is designed to fulfil the purpose of the variable speed limit system, which can be one or several of the following aspects: increasing safety, increasing efficiency and decreasing environmental impacts. Today, many of the control algorithms used in practice are based on fixed thresholds in speed and/or flow. Therefore, they are not necessarily reflecting the current traffic conditions. Control algorithms with a greater level of complexity can be found in the literature. In this paper, four existing control algorithms are investigated to conclude on important characteristics affecting the performance of the variable speed limit system. The purpose of the variable speed limit system and, consequently, the design of the control algorithm differ. Requirements of the investigated control algorithms are that they should be easy to interpret and the execution time should be short. The algorithms are evaluated through microscopic traffic simulation. Performance indicators related to traffic safety, traffic efficiency and environmental impacts are presented. The results show that the characteristics of the variable speed limit system and the design of the control algorithm will have effect on the resulting traffic performance, given that the drivers comply with the variable speed limits. Moreover, the time needed to trigger the system, the duration and the size of speed limit reductions, and the location of the congestion are factors of importance for the performance of variable speed limit systems.

Place, publisher, year, edition, pages
SPRINGER HEIDELBERG, 2018
Keywords
Variable speed limit, Algorithm, Characteristics, Traffic, Micro, Simulation, Traffic flow, Efficiency, Evaluation (assessment), Safety, Emission, Congestion (traffic)
National Category
Transport Systems and Logistics
Research subject
20 Road: Traffic engineering, 22 Road: Traffic control and traffic information; 20 Road: Traffic engineering, 25 Road: Traffic theory
Identifiers
urn:nbn:se:vti:diva-13109 (URN)10.1186/s12544-018-0294-8 (DOI)000434026100001 ()2-s2.0-85047992584 (Scopus ID)
Available from: 2018-09-10 Created: 2018-09-10 Last updated: 2018-12-17Bibliographically approved
Grumert, E. & Tapani, A. (2018). Traffic State Estimation Using Connected Vehicles and Stationary Detectors. Journal of Advanced Transportation, Article ID UNSP 4106086.
Open this publication in new window or tab >>Traffic State Estimation Using Connected Vehicles and Stationary Detectors
2018 (English)In: Journal of Advanced Transportation, ISSN 0197-6729, E-ISSN 2042-3195, article id UNSP 4106086Article in journal (Refereed) Published
Abstract [en]

Real-time traffic state estimation is of importance for efficient traffic management. This is especially the case for traffic management systems that require fast detection of changes in the traffic conditions in order to apply an effective control measure. In this paper, we propose a method for estimating the traffic state and speed and density, by using connected vehicles combined with stationary detectors. The aim is to allow fast and accurate estimation of changes in the traffic conditions. The proposed method does only require information about the speed and the position of connected vehicles and can make use of sparsely located stationary detectors to limit the dependence on the infrastructure equipment. An evaluation of the proposed method is carried out by microscopic traffic simulation. The traffic state estimated using the proposed method is compared to the true simulated traffic state. Further, the density estimates are compared to density estimates from one detector-based method, one combined method, and one connected-vehicle-based method. The results of the study show that the proposed method is a promising alternative for estimating the traffic state in traffic management applications.

Place, publisher, year, edition, pages
WILEY-HINDAWI, 2018
Keywords
Traffic flow, Real time, Traffic control, Traffic concentration, Speed, Estimation, Connected vehicle, Detector
National Category
Transport Systems and Logistics
Research subject
20 Road: Traffic engineering, 23 Road: ITS och traffic
Identifiers
urn:nbn:se:vti:diva-12818 (URN)10.1155/2018/4106086 (DOI)000423031600001 ()2-s2.0-85042641207 (Scopus ID)
Available from: 2018-04-05 Created: 2018-04-05 Last updated: 2018-06-11Bibliographically approved
Lindberg, T., Peterson, A. & Tapani, A. (2017). A Simulation Model of Local Public Transport Access at a Railway Station. In: N. Tomii, I.A. Hansen, J. Rodriguez, P. Pellegrini, S. Dauzère-Pérès, D. De Almeida (Ed.), : . Paper presented at 7th International Conference on Railway Operations Modelling and Analysis (RailLille2017), Lille, April 4-7, 2017 (pp. 922-943).
Open this publication in new window or tab >>A Simulation Model of Local Public Transport Access at a Railway Station
2017 (English)In: / [ed] N. Tomii, I.A. Hansen, J. Rodriguez, P. Pellegrini, S. Dauzère-Pérès, D. De Almeida, 2017, p. 922-943Conference paper, Published paper (Other academic)
Abstract [en]

A high quality railway service requires that all parts of the complete journey, from door to door, are well-functioning. This includes any transfers taking place, as well as last mile transportation to and from the railway station. Since the last mile often consists of local public transport, the access to this mode at stops and terminals and how well these are functioning are of great importance. A critical aspect is the capacity of the stop or the terminal in relation to the number of departures, where a higher capacity generally means an increase in size. At the same time it is desirable to limit the use of valuable land and keeping the facility as small as possible. The trade-off between capacity and size needs to be evaluated when designing stops and terminals.

In this study we have developed a discrete event simulation model of a combined bus and tram stop, which is a part of a larger multi-modal station. The objective of the study is to evaluate the modelling approach for the situation at hand. Of special interest are the complexities due to the different driving patterns of buses and trams. The developed model is capable of evaluating design alternatives and is applied in a case study of a stop at Norrköping railway station in southern Sweden. The model was found to realistically capture the various events occurring at such a stop and the case study further showed that the model is a useful tool in design evaluation.

Keywords
Passenger, Change (transp), Simulation, Station (railway), Stop (public transport), Design (overall design)
National Category
Transport Systems and Logistics
Research subject
J00 Railway: General works, surveys, comprehensive works, J07 Railway: Stations
Identifiers
urn:nbn:se:vti:diva-11828 (URN)978-2-85782-723-8 (ISBN)
Conference
7th International Conference on Railway Operations Modelling and Analysis (RailLille2017), Lille, April 4-7, 2017
Available from: 2017-05-10 Created: 2017-05-10 Last updated: 2017-06-08Bibliographically approved
Eriksson, J., Liu, C., Forward, S., Forsman, Å., Niska, A., Tapani, A. & Wallén Warner, H. (2017). Säkerhetseffekten av ökat cyklande: kartläggning av nuläget för att planera för framtiden. Linköping: Statens väg- och transportforskningsinstitut
Open this publication in new window or tab >>Säkerhetseffekten av ökat cyklande: kartläggning av nuläget för att planera för framtiden
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2017 (Swedish)Report (Other academic)
Alternative title[en]
The safety effect of an increased cycling : mapping of the current situation for planning for the future
Abstract [sv]

Under senare år har cykeln lyfts fram som ett transportmedel med många positiva egenskaper och i nationella strategidokument har det uttryckts en önskan om att cyklingen ska öka. Samtidigt poängteras att säkerheten för cyklister måste bli bättre så att en ökad cykling inte leder till fler skadade och omkomna cyklister. För att klara av att öka cyklandet utan att försämra säkerheten, behövs underlag för att fatta beslut om vilka åtgärder som behöver genomföras. Bland annat behövs bättre kunskap om sambandet mellan cykelflöde och skaderisk i olika trafikmiljöer.

I syfte att studera hur sättet att använda cykeln förändras över tid och hur cyklisters skaderisk påverkas av cykelflöde och trafikmiljön, har tre olika delstudier genomförts i det här projektet. I den första delstudien har en modell utvecklats som innehåller både färdmedelsval och destinationsval för cykel. I den andra delstudien har modeller för skaderisker hos cyklister utvecklats för olika olyckstyper och trafikmiljöer. I den tredje delstudien har interaktioner mellan olika trafikanter observerats, i syfte att studera hur dessa påverkas av nivån på cykelflödet. Sammantaget visar studierna i projektet att cykelflödet har betydelse för cyklisters olycksrisk. Högre flöden ger färre interaktioner per cyklist och lägre risk att skadas i såväl singelolyckor som kollision med motorfordon. Vi har också kunnat visa att det är möjligt att modellera färdmedels- och destinationsval för cykel såväl som att med hjälp av modeller beskriva effekter på cyklisters skaderisk. För att kunna göra bättre skattningar som mer rättvist beskriver verkligheten behövs dock ett bättre dataunderlag till modellerna, framförallt när det gäller cykelresor och beskrivning av cykelinfrastrukturen.

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.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2017. p. 110
Series
VTI rapport, ISSN 0347-6030 ; 951
Keywords
Cycling, Safety, Accident, Risk, Behaviour, Near miss, Observation, Traffic flow, Journey, Forecast, Model (not math)
National Category
Transport Systems and Logistics
Research subject
10 Road: Transport, society, policy and planning, 113 Road: Cycling, walking and moped transport; 80 Road: Traffic safety and accidents, 841 Road: Road user behaviour; 80 Road: Traffic safety and accidents, 813 Road: Accident risk
Identifiers
urn:nbn:se:vti:diva-12468 (URN)
Available from: 2017-10-23 Created: 2017-10-20 Last updated: 2019-06-10Bibliographically approved
Grumert, E. & Tapani, A. (2017). Using connected vehicles in a variable speed limit system. In: Transportation Research Procedia: . Paper presented at 20th EURO Working Group on Transportation Meeting, EWGT 2017, 4-6 September 2017, Budapest, Hungary (pp. 85-92). Elsevier B.V.
Open this publication in new window or tab >>Using connected vehicles in a variable speed limit system
2017 (English)In: Transportation Research Procedia, Elsevier B.V. , 2017, p. 85-92Conference paper, Published paper (Refereed)
Abstract [en]

Variable speed limit systems are used to improve the traffic conditions on specific road stretches. This is done by adjusting the speed limits according to current traffic situations. A variable speed limit system usually consist of stationary detectors to estimate the traffic state and variable message signs at predefined locations for the application of new speed limits. Advances in vehicle technology have made it possible to use connected vehicles to improve existing variable speed limit systems. Connected vehicles can continuously transmit information about speed and location. This can be used to get more detailed information about the traffic state. By including information from connected vehicles in a variable speed limit system there is a potential to identify bottlenecks also in between stationary detectors. Further, it is possible to use direct control of the connected vehicles to adjust vehicle speeds towards the new traffic situation. In this study, we propose such a variable speed limit system based on connected vehicles. The aim is to allow for application of variable speed limits in connection with non-recurrent bottlenecks. The proposed system is evaluated with respect to traffic efficiency using microscopic traffic simulation. An incident is simulated as an example of a non-recurrent bottleneck. The traffic performance when the proposed VSL system is applied is compared to the performance without the system. The results indicate that the VSL system manage to improve traffic efficiency in a majority of the simulated cases.

Place, publisher, year, edition, pages
Elsevier B.V., 2017
Keywords
Variable speed limit, Connected vehicle, Data acquisition, Bottleneck, Detection
National Category
Transport Systems and Logistics
Research subject
20 Road: Traffic engineering, 22 Road: Traffic control and traffic information; 20 Road: Traffic engineering, 21 Road: Traffic measurement and traffic analysis
Identifiers
urn:nbn:se:vti:diva-12766 (URN)10.1016/j.trpro.2017.12.050 (DOI)2-s2.0-85039968875 (Scopus ID)
Conference
20th EURO Working Group on Transportation Meeting, EWGT 2017, 4-6 September 2017, Budapest, Hungary
Available from: 2018-04-23 Created: 2018-04-23 Last updated: 2018-06-11Bibliographically approved
Vadeby, A., Anund, A., Ekström, C., Gustafsson, S., Lundberg, T., Olstam, J. & Tapani, A. (2016). Säker framkomlighet: sammanfattande slutrapport 2015. Linköping: Statens väg- och transportforskningsinstitut
Open this publication in new window or tab >>Säker framkomlighet: sammanfattande slutrapport 2015
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2016 (Swedish)Report (Other academic)
Alternative title[en]
Safe accessibility : summarized results 2015
Abstract [sv]

Föreliggande rapport redovisar övergripande resultat av fyra olika åtgärder som implementerats inomTrafikverkets projekt ”Säker framkomlighet” vilket haft som syfte att förbättra framkomlighet ochtrafiksäkerhet på främst befintliga tvåfältsvägar med hastighetsgräns 90 km/tim. Åtgärderna somstuderats är: frästa mitträfflor på 2-fältsvägar, vägrensräffling på motorväg, smala mötesfria vägar(”gles 2+1-väg med räcke”) och riktningsseparerade vägar (2+1 med målad/räfflad mitt).Resultaten visar att för samtliga åtgärder har trafiksäkerhetseffekterna varit positiva med minskningarav de dödade och svårt skadade trafikanterna. Vad gäller spårdjupstillväxt visar resultaten att mitträfflinginte har en kanaliserande effekt på trafiken och därmed påverkas inte heller spårbildningen.För mötesfria vägar är den årliga spårdjupsutvecklingen cirka 25 procent högre för mötesfri väg än förmotsvarande vanlig väg för årsdygnstrafik (ÅDT) > 8 000 fordon/dygn. För lägre ÅDT är skillnaden 10–15 procent.För riktningsseparerade vägar visar resultaten endast på högre spårdjupstillväxt för ÅDT över 8 000fordon/dygn. En studie om effekter och konsekvenser av olika räffeltyper avseende buller visar att detinte finns kända argument för att inte använda sinusräffla, men ytterligare studier kring effekten förförare av tunga fordon rekommenderas. Studien avseende framkomlighetseffekter visar att andelentung trafik är en viktig faktor att beakta i utformningen av mötesfria vägar.

Abstract [en]

This report consolidates evaluations performed within the project “Safe accessibility” on behalf of the Swedish Transport Administration. Four different measures implemented on rural roads in Sweden with the aim to increase traffic safety and improve accessibility are investigated. The measures are; milled centerline rumble strips on rural 2-lane roads, shoulder rumble strips on motorways, narrow2+1 roads with median barrier and divided roads (painted 2+1 roads with median rumble strips).As regards traffic safety, all four measures show reductions in the number of fatalities and seriously injured. For milled centerline rumble strips on rural 2-lane roads, they do not have a confining effect on traffic and have no adverse effect on the rate of rutting. For barrier separated roads (2+1), the results indicated that for Average Annual Daily Traffic (AADT) levels greater than 8,000 vehicles, the annual rut depth development rate is about 25 percent higher than for conventional rural roads. With lower AADT levels, differences reduced to between 10–15 percent. Comparisons between divided roads and conventional roads only showed higher annual rut development rates for AADT levels greater than 8,000 vehicles. A study about the effects and consequences of different types of milled rumble strips showed that there are no known arguments for not using the sinus rumble strips. However, further studies on the impact of drivers of heavy vehicles are recommended. Studies of the effect on traffic efficiency showed that the proportion of Heavy Goods Vehicles (HGVs) is an important factor to consider in the design of narrow 2+1 roads and the proportion of HGVs need to be taken into account in the selection of the length of overtaking lanes.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2016. p. 42
Series
VTI rapport, ISSN 0347-6030 ; 898
Keywords
Highway, Accident prevention, Rumble strip, Safety fence, Central reserve, Rut, Accident rate, Noise, Evaluation (assessment), Before and after study, Safety
National Category
Infrastructure Engineering
Research subject
80 Road: Traffic safety and accidents, 82 Road: Geometric design and traffic safety
Identifiers
urn:nbn:se:vti:diva-10746 (URN)
Available from: 2016-07-08 Created: 2016-07-08 Last updated: 2019-05-17Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-9635-5233

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