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When do drivers yield to cyclists at unsignalized roundabouts?: Empirical evidence and behavioral analysis
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Transport Planning, Economics and Engineering.ORCID iD: 0000-0002-7080-5176
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Transport Planning, Economics and Engineering.
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Transport Planning, Economics and Engineering.
2015 (English)In: Transportation Research Record, ISSN 0361-1981, E-ISSN 2169-4052, no 2520, 25-31 p.Article in journal (Refereed) Published
Abstract [en]

Cycling popularity has shown an increasing trend during the last decades in many cities of Europe and USA because of its environmental and health benefits. However, cyclists are frequently involved in traffic accidents, especially, when they interact with vehicles at unsignalized intersections. There is still lack of evidence and analysis on how such interaction is performed. This paper explores empirical evidence of the vehicle-bicycle interaction on a typical Swedish roundabout, and provides insights into factors influencing car drivers’ yielding decisions when they interact with cyclists. The vehicle-bicycle interaction was divided into category groups (Non-Conflict, Conflict, Yield, and Non-Yield) and their speed differences were analyzed by group. Furthermore, a discrete choice model was developed to estimate behavioral aspects of such interactions. The observed data showed a higher and significant speed variation among vehicles, whereas bicycles exhibited lower variation across the groups. The modelling results revealed that the yielding probability decreased when the speed of the vehicle was higher. On the other hand, the bicycle speed had little impact on drivers’ decision to yield. More importantly, the yielding probability increased significantly by the proximity of the cyclist to the conflicting zone. The yielding rate of drivers can be improved by keeping vehicles’ speed under 20 km/h, as drivers have the capacity to detect and yield to cyclists.  

Place, publisher, year, edition, pages
2015. no 2520, 25-31 p.
Keyword [en]
Vehicle-bicycle interaction, roundabout, yielding behavior, logistic regression models
National Category
Transport Systems and Logistics
Research subject
Transport Science
Identifiers
URN: urn:nbn:se:kth:diva-163553DOI: 10.3141/2520-04ISI: 000371445000004OAI: oai:DiVA.org:kth-163553DiVA: diva2:800906
Conference
94th Annual Meeting of The Transportation Research Board. January 11-15, 2015 Washington, D.C., USA
Projects
CycleSafe
Note

QC 20150417. QC 20160411

Available from: 2015-04-08 Created: 2015-04-08 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Advancing Traffic Safety: An evaluation of speed limits, vehicle-bicycle interactions, and I2V systems
Open this publication in new window or tab >>Advancing Traffic Safety: An evaluation of speed limits, vehicle-bicycle interactions, and I2V systems
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Since the introduction of motor vehicles, the number of fatalities and accidents has been a concern for society.The number of fatalities on roads is amongst the most common causes of mortality worldwide (WHO, 2015).Even in industrialized countries the number of fatalities remains unacceptable. Therefore, in the last decades, anumber of approaches have emerged to support and boost traffic safety towards a system free from fatalities andserious impairment outcomes. ‘Sustainable Safety’ and ‘Vision Zero’ are well-known examples aiming to avoidfatalities within the traffic system and reduce injury severity when a traffic accident is inevitable. However, thenumber of fatalities and seriously injured accidents are still relatively high. More specifically, vulnerable roadusers remain involved in fatal and serious accidents even in industrialized countries. Therefore, further advancesin traffic safety studies are needed. This thesis aims at evaluating the impact of road characteristics, traffic rulesand information provision towards a safer traffic system. The thesis is composed of five scientific papers whichsummarizes the main contributions of this work.

Place, publisher, year, edition, pages
Stockholm: KTH, 2016. 20 p.
Series
TRITA-TSC-PHD, 16-008
Keyword
Traffic safety, urban roads, posted speed limits, road characteristics, free-flow speed, time headway, vehicle-bicycle interactions, logit model, yielding probability, cooperative systems and warning messages.
National Category
Transport Systems and Logistics
Research subject
Transport Science
Identifiers
urn:nbn:se:kth:diva-195640 (URN)978-91-87353-94-9 (ISBN)
Public defence
2016-12-16, Kollegiesalen, Brinellvägen 8, Stockholm, 14:00 (English)
Opponent
Supervisors
Note

QC 20161109

Available from: 2016-11-09 Created: 2016-11-07 Last updated: 2016-11-10Bibliographically approved

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Silvano, Ary P.

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