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Silvano, A. P., Olstam, J., Singh, A. & Bolbat, M. (2019). Frånfartskapacitet i cirkulationsplatser: effekter av korsande gång- och cykelflöden. Linköping: Statens väg- och transportforskningsinstitut
Open this publication in new window or tab >>Frånfartskapacitet i cirkulationsplatser: effekter av korsande gång- och cykelflöden
2019 (Swedish)Report (Other academic)
Alternative title[en]
Exit capacity at roundabouts : impact on capacity of crossing pedestrians and bicycles
Abstract [sv]

När det gäller bedömning av framkomlighet i korsningar finns ett behov av metodutveckling för beräkning av oskyddade trafikanters påverkan på fordonstrafiken och vice versa. Detta är speciellt viktigt i cirkulationsplatser eftersom fordonstrafiken som kör ut från en cirkulationsplats ska lämna företräde till korsande gång- och cykeltrafik vilket ibland skapar bakåtblockering av fordon in i cirkulationsplatsen. Den nuvarande kapacitetsberäkningsmetoden i Trafikverkets ”kapacitetsmanual”, TRVMB Kapacitet och framkomlighetseffekter Trafikverkets metodbeskrivning för beräkning av kapacitet och framkomlighetseffekter i vägtrafikanläggningar, som finns implementerade i Capcal beaktar endast korsande gång och cykel (GC) trafikanter vid övergångsställen i tillfarter.

Denna rapport redovisar en studie med syfte att identifiera och undersöka metoder som kan beakta kapacitetsnedsättande effekter av korsande GC-trafik i cirkulationsplatser. Detta för att på sikt kunna överbrygga de brister som finns i den nuvarande metoden. Det är viktig att interaktioner mellan bilister och andra trafikanter ingår i den valda metoden. Den eller de metoder som är intressanta att studera vidare är de metoder som kan beakta korsande gång- och cykeltrafik i tillfart och frånfart i cirkulationsplatser. Dessutom måste den valda metoden beakta olika väjningsbeteende för fordon, gång- och cykeltrafik. Gap-acceptans (GAP) metoder har svårigheter när gång- och cykeltrafik beaktas i modellen på grund av varierande efterlevnad av företrädesregler.

Den genomförda litteraturstudien resulterade i fyra potentiella angreppssätt för att modellera effekter av korsande gång- och cykeltrafikanter i frånfarter i cirkulationsplatser. Ett av angreppssätten (Wu, 2001) har i olika utsträckning tillämpats för såväl japanska förhållanden (Kang och Nakamura, 2014, Kang et al., 2014) och tyska förhållanden (Wu och Brilon, 2017, Wu och Brilon, 2018). Av dessa två tillämpningarna av Wus teori är tillämpningen av Wu och Brilon (den så kallade konflikttekniken) den mest lovande och lämplig avseende bristerna i den nuvarande metoden i Capcal som identifierades.

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.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2019. p. 62
Series
VTI notat ; 4-2019
National Category
Transport Systems and Logistics
Identifiers
urn:nbn:se:vti:diva-13708 (URN)
Available from: 2019-04-26 Created: 2019-04-26 Last updated: 2019-04-26Bibliographically approved
Gyergyay, B., Gomari, S., Friedrich, M., Sonnleitner, J., Olstam, J. & Johansson, F. (2018). Automation-ready framework for urban transport and road infrastructure planning. In: : . Paper presented at TUM 2018 "Urban Mobility – Shaping the Future Together" - International Scientific Conference on Mobility and Transport, June 13, 2018, Munich, Germany.
Open this publication in new window or tab >>Automation-ready framework for urban transport and road infrastructure planning
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2018 (English)Conference paper, Oral presentation with published abstract (Refereed)
Keywords
Autonomous driving, Analysis (math), Urban area, Transport infrastructure, Traffic
National Category
Infrastructure Engineering
Research subject
20 Road: Traffic engineering, 25 Road: Traffic theory
Identifiers
urn:nbn:se:vti:diva-13452 (URN)
Conference
TUM 2018 "Urban Mobility – Shaping the Future Together" - International Scientific Conference on Mobility and Transport, June 13, 2018, Munich, Germany
Available from: 2018-12-28 Created: 2018-12-28 Last updated: 2019-03-14Bibliographically approved
Gyergyay, B., Gomari, S., Olstam, J., Johansson, F., Friedrich, M., Sonnleitner, J., . . . Backhaus, W. (2018). Automation-ready framework for urban transport planning. In: Proceedings of 7th Transport Research Arena TRA 2018, April 16-19, 2018, Vienna, Austria: . Paper presented at Transport Research Arena TRA 2018.
Open this publication in new window or tab >>Automation-ready framework for urban transport planning
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2018 (English)In: Proceedings of 7th Transport Research Arena TRA 2018, April 16-19, 2018, Vienna, Austria, 2018Conference paper, Published paper (Refereed)
Abstract [en]

The mission of the H2020 CoEXist project is to enable mobility stakeholders to get “Automation-ready” – which CoEXist currently defines as conducting transport and infrastructure planning for connected and automated vehicles (CAVs) in the same comprehensive manner as for existing modes such as conventional vehicles, public transport, pedestrians, and cyclists, while ensuring continued support for existing modes on the same network. This definition will be fine-tuned through stakeholder engagement processes. The H2020 CoEXist project started in May 2017 and will run until April 2020. This paper introduces this project and covers its progress until January 2018, with a focus on the methodology of the “Automation-ready framework” that provides a planning framework for urban road authorities to prepare for the introduction of CAVs on the road network. The framework includes elements about strategic urban mobility planning for CAVs and a clear guide for urban transport planners with a list of concrete actions that cities can do now to plan for CAVs on their road network

Keywords
Transport, Planning, Connected vehicle, Automatic, Autonomous vehilce, Transport authority, Mobility (pers)
National Category
Transport Systems and Logistics
Research subject
20 Road: Traffic engineering, 22 Road: Traffic control and traffic information; 10 Road: Transport, society, policy and planning
Identifiers
urn:nbn:se:vti:diva-13103 (URN)
Conference
Transport Research Arena TRA 2018
Projects
CoEXist
Funder
EU, Horizon 2020, 203438
Available from: 2018-06-01 Created: 2018-06-01 Last updated: 2018-06-12Bibliographically approved
(2018). Completed experimental design templates for eight use cases and AV-ready alternative: Deliverable D3.1 of the CoEXist project.
Open this publication in new window or tab >>Completed experimental design templates for eight use cases and AV-ready alternative: Deliverable D3.1 of the CoEXist project
2018 (English)Report (Other academic)
Keywords
Autonomous vehicle, Simulation, Traffic
National Category
Transport Systems and Logistics
Research subject
20 Road: Traffic engineering, 22 Road: Traffic control and traffic information
Identifiers
urn:nbn:se:vti:diva-13978 (URN)
Available from: 2019-06-25 Created: 2019-06-25 Last updated: 2019-10-01Bibliographically approved
Jonkers, E., Nellthorp, J., Wilmink, I. & Olstam, J. (2018). Evaluation of eco-driving systems: A European analysis with scenarios and micro simulation. Case Studies on Transport Policy
Open this publication in new window or tab >>Evaluation of eco-driving systems: A European analysis with scenarios and micro simulation
2018 (English)In: Case Studies on Transport Policy, ISSN 2213-624X, E-ISSN 2213-6258Article in journal (Refereed) In press
Abstract [en]

In recent years, various field operational tests (FOTs) have been carried out in the EU to measure the real-world impacts of Intelligent Transport Systems (ITS). A challenge arising from these FOTs is to scale up from the very localised effects measured in the tests to a much wider set of socio-economic impacts, for the purposes of policy evaluation. This can involve: projecting future take-up of the systems; scaling up to a wider geographical area – in some cases the whole EU; and estimating a range of economic, social and environmental impacts into the future. This article describes the evaluation conducted in the European project ‘ecoDriver’, which developed and tested a range of driver support systems for cars and commercial vehicles. The systems aimed to reduce CO2 emissions and energy consumption by encouraging the adoption of green driving behaviour. A novel approach to evaluation was adopted, which used scenario-building and micro-simulation to help scale up the results from field tests to the EU-28 level over a 20 year period, leading to a cost-benefit analysis (CBA) from both a societal and a stakeholder perspective. This article describes the method developed and used for the evaluation, and the main results for eco-driving systems, focusing on novel aspects, lessons learned and implications for policy and research.

Place, publisher, year, edition, pages
Elsevier Ltd, 2018
Keywords
Environment, Driver assistance system, Evaluation (assessment), Driver, Behaviour, Emission, Fuel consumption, Forecast, Europe, Micro, Simulation, Cost benefit analysis
National Category
Transport Systems and Logistics
Research subject
20 Road: Traffic engineering, 23 Road: ITS och traffic
Identifiers
urn:nbn:se:vti:diva-13242 (URN)10.1016/j.cstp.2018.08.001 (DOI)2-s2.0-85051383948 (Scopus ID)
Available from: 2018-09-12 Created: 2018-09-12 Last updated: 2018-12-19Bibliographically approved
(2018). Scenario specifications for eight use cases: Deliverable D1.4 of the CoEXist project.
Open this publication in new window or tab >>Scenario specifications for eight use cases: Deliverable D1.4 of the CoEXist project
2018 (English)Report (Other academic)
Keywords
Autonomous vehicle, Simulation, Traffic
National Category
Transport Systems and Logistics
Research subject
20 Road: Traffic engineering, 22 Road: Traffic control and traffic information
Identifiers
urn:nbn:se:vti:diva-13980 (URN)
Available from: 2019-06-25 Created: 2019-06-25 Last updated: 2019-10-01Bibliographically approved
(2018). Use case specifications: Deliverable D1.3 of the CoEXist project.
Open this publication in new window or tab >>Use case specifications: Deliverable D1.3 of the CoEXist project
2018 (English)Report (Other academic)
Keywords
Autonomous vehicle, Simulation, Traffic
National Category
Transport Systems and Logistics
Research subject
20 Road: Traffic engineering, 22 Road: Traffic control and traffic information
Identifiers
urn:nbn:se:vti:diva-13979 (URN)
Available from: 2019-06-25 Created: 2019-06-25 Last updated: 2019-10-01Bibliographically approved
Bernhardsson, V. & Olstam, J. (2017). Effektiva omkörningsfält på 2+1-vägar: trafiksimuleringar av olika utformningsalternativ ur ett framkomlighetsperspektiv. Linköping: Statens väg- och transportforskningsinstitut
Open this publication in new window or tab >>Effektiva omkörningsfält på 2+1-vägar: trafiksimuleringar av olika utformningsalternativ ur ett framkomlighetsperspektiv
2017 (Swedish)Report (Other academic)
Alternative title[en]
Effective overtaking lanes on 2+1 roads : a traffic simulation study of different configurations of 2+1 roads from a traffic performance perspective
Abstract [sv]

Framkomligheten på mötesseparerade vägar med växelvis omkörningsfält (så kallade 2+1-vägar) beror på hur stor del av vägens sträckning som har omkörningsfält, vilket brukar benämnas som andelen omkörbar längd. För att utnyttja vägen på ett effektivt sätt bör utformningen och lokaliseringen av omkörningsfälten upprättas för att i största möjliga mån undvika onödig köbildning och fördröjning. Olika utformningsalternativ för omkörningsfälten har olika fördelar. Kortare omkörningsfält innebär begränsade tidsfönster för köavveckling, men medför samtidigt snabba upprepningar av omkörningstillfällen. Längre omkörningssträckor innebär bättre möjlighet till omkörning av flera fordon vid ett och samma tillfälle, men medför samtidigt ökade enfältslängder vilket ökar risken för upphinnanden.

Denna rapport presenterar en trafiksimuleringsstudie av hur olika längder för omkörningsfälten påverkar framkomligheten. Resultaten från simuleringsstudien indikerar att omkörningsfält med längder mellan 1 050 och 1 400 meter innebär kortast restid. Skillnaderna är dock små (~0,4 sekunder per kilometer) och dessutom inte statistiskt signifikanta. Nyttan med att utforma 2+1-vägar med optimala längder för omkörningsfälten för att maximera framkomlighet kan således ifrågasättas. Baserat på resultaten är det dock rimligt att ifrågasätta konceptet med att bygga mycket långa omkörningsfält (som den nuvarande rekommendationen i Trafikverkets riktlinjer för vägars- och gators utformning (VGU) till viss del antyder). Det är tydligt att risken för upphinnanden på enfältssträckorna är mycket stora, vilket påverkar den totala restiden.

Abstract [en]

The traffic performance at oncoming lane separated highways with alternating dedicated overtaking lanes (so called 2+1 roads), is dependent on the share of two lane segments (also known as the share of overtaking length). In order to maximize utilization and traffic performance, the configuration of the overtaking lanes should be designed to avoid congestion and delays. Short overtaking lanes implies limited time of queue discharge, but gives frequently recurring possibilities to overtake. Increased lengths of overtaking lanes imply the possibility to overtake several vehicles per overtaking lane, but increases the risk of catching up slower vehicles since the configuration also results in increased lengths of one lane segments.

This report presents a traffic simulation study of how different configurations affects the throughput at 2+1 roads. The results indicate that overtaking lanes between 1 050 and 1 400 meters result in shortest travel time. However, the differences are small (~0.4 seconds/km) and not statistically significant. Thus, the benefit of optimizing the configuration in terms of throughput could be questioned. Based on the results, it becomes reasonable to question the concept of designing 2+1 roads with long overtaking lengths (which corresponds to the recommendations from the Swedish Transport Administration (Trafikverket)). The major risk of catching up a slower vehicle at the one lane segments obviously affects the travel time.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2017. p. 49
Series
VTI rapport, ISSN 0347-6030 ; 941
Keywords
Traffic lane, Traffic flow, Simulation, Level of service, Geometric design, Central reserve, Safety fence
National Category
Infrastructure Engineering
Research subject
20 Road: Traffic engineering, 21 Road: Traffic measurement and traffic analysis
Identifiers
urn:nbn:se:vti:diva-12075 (URN)
Available from: 2017-09-06 Created: 2017-09-05 Last updated: 2019-05-16Bibliographically approved
Tsanakas, N., Ekström, J. & Olstam, J. (2017). Emission estimation based on cross-sectional traffic data. In: Proceedings of the 22nd International Transportation and Air Pollution Conference, 2017: . Paper presented at 22nd International Transportation and Air Pollution Conference, Zürich, Switzerland, 15-16 November 2017 (pp. 15).
Open this publication in new window or tab >>Emission estimation based on cross-sectional traffic data
2017 (English)In: Proceedings of the 22nd International Transportation and Air Pollution Conference, 2017, 2017, p. 15-Conference paper, Published paper (Refereed)
Abstract [en]

The paper outlines as follows: Section 2 consists a literature review on methods for emission estimations based on sensors measurements. Section 3 provides a description of the methodology of estimating emissions from cross-sectional data by either using AADT estimation techniques or more sophisticated traffic estimators. Section 4 presents the case study that is a part of the E4 motorway in Stockholm, and provides details about the data collection. The results are presented in Section 5 and finally Section 6 concludes the study and discusses future work.

Keywords
Emission, Calculation, Estimation, Traffic, Detector, Measurement, Traffic flow, Traffic density
National Category
Civil Engineering Transport Systems and Logistics
Research subject
10 Road: Transport, society, policy and planning, 15 Road: Environment
Identifiers
urn:nbn:se:vti:diva-13102 (URN)
Conference
22nd International Transportation and Air Pollution Conference, Zürich, Switzerland, 15-16 November 2017
Projects
Förbättrad prognos av energianvändning och emissioner vid styrmedelsanalys i vägtrafiken
Funder
Swedish Energy Agency, 38921-1
Available from: 2018-06-01 Created: 2018-06-01 Last updated: 2018-06-12Bibliographically approved
Olstam, J. & Bernhardsson, V. (2017). Hastighetsflödessamband för svenska typvägar: Förslag till reviderade samband baserat på trafikmätningar från 2012–2015. Linköping: Statens väg- och transportforskningsinstitut
Open this publication in new window or tab >>Hastighetsflödessamband för svenska typvägar: Förslag till reviderade samband baserat på trafikmätningar från 2012–2015
2017 (Swedish)Report (Other academic)
Alternative title[en]
Speed-flow relationships for Swedish rural roads : Suggestions for revised relationships based on traffic measurements from 2012–2015
Abstract [sv]

Hastighetsflödessamband är en viktig del i Trafikverkets modell för bedömning av Effekter vid väganalyser (EVA). I denna rapport presenteras förslag till nya hastighetsflödessamband för motorvägar, fyrfältsvägar, mötesfria motortrafikleder, mötesfria landsvägar samt tvåfältiga landsvägar. Förslagen baseras på data från mätningar med Trafikverkets trafikmätningssystem (TMS) samt kompletterande modellberäkningar. För varje vägkategori har TMS-datamaterialet kvalitetssäkrats, bearbetats och analyserats. Datamaterialet presenteras i form av hastighetsflödesdiagram för personbilar, bussar och lastbilar utan släp samt lastbilar med släp. För varje typsektion har sedan en jämförelse av nuvarande samband och mätdata genomförts. Vid behov har förslag till revidering av nuvarande samband tagits fram. De mest signifikanta förändringarna jämfört med föregående revidering från 2013 är: medelfrihastigheten för lastbilar utan släp har generellt sett ökat på samtliga vägtyper utom tvåfältsvägar där hastigheten minskat; medelfrihastigheten för lastbilar med släp har generellt sett minskat; hastigheten på tvåfältsvägar har generellt sett minskat.

Abstract [en]

Speed-flow relationships are an important part of the Swedish Transport Administration (Trafikverket) model for evaluation of effects of road facilities (the EVA model). This report present suggestions for new speed-flow relationships for motorways (MV), low standard motorways (4F), oncoming lane separated highways with grade separated intersections (MML), oncoming separated highways with at grade intersections (MLV), and two-lane highways. The suggestions are based on data from measurements using the Swedish Transport Administration’s traffic measurement system TMS in combination with model calculations. The TMS data have, for each road category, been quality checked, processed and analysed. The data material is presented as speed-flow diagrams for passenger cars, buses and trucks without trailer, and trucks with trailers. A comparison of the current speed-flow relationships and the TMS-measurements was then conducted for each road category, and if needed a suggestion for a revision was presented. The most significant changes from last revision from 2013 are: average free flow speed for trucks without trailer have in general increased for all road types except two lane highways for which the speed has decreased; average free flow speed for trucks with trailers have in general decreased; and the average speed on two lane highways have in general decreased

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2017. p. 162
Series
VTI rapport, ISSN 0347-6030 ; 938
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:vti:diva-11896 (URN)
Available from: 2017-07-03 Created: 2017-07-03 Last updated: 2017-07-03Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-0336-6943

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