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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
URN: urn:nbn:se:kth:diva-163553DOI: 10.3141/2520-04ISI: 000371445000004OAI: diva2:800906
94th Annual Meeting of The Transportation Research Board. January 11-15, 2015 Washington, D.C., USA

QC 20150417. QC 20160411

Available from: 2015-04-08 Created: 2015-04-08 Last updated: 2016-05-13Bibliographically approved

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