Research Papers

Are Intersections With Cycle Tracks Safer? A Control-Case Study Based On Automated Surrogate Safety Analysis Using Video Data

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Date added June 18, 2015
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Category 2015 CARSP XXV Ottawa
Tags Research and Evaluation, Session 3B, Student Paper Award Winner
Author/Auteur Sohail Zangenehpour, Jillian Strauss, Luis F. Miranda-Moreno, Nicolas Saunier
Stream/Volet Research and Evaluation
Award/Prix Étudiant 1 Student

Slidedeck Presentation - not available

Abstract

In recent years, cities in North America have been building cycle tracks with the intention of
providing cyclists with a safer alternative to biking in the street. These facilities have been built and
expanded but very little research has been done to investigate the safety impact of cycle tracks, in
particular at intersections, where cyclists interact with turning-motor-vehicles. Some of the safety
research has looked at observed injuries, finding some positive safety impacts of cycle tracks. The
objective of this work is to investigate the safety effects of cycle tracks at intersections using a
control-case study. For this purpose, a video-based method is proposed for analysing the postencroachment
time as a surrogate measure of the interactions between cyclists and turningvehicles
traveling in the same direction. Using the city of Montreal as the case study, a sample of
intersections with and without cycle tracks on the right and left sides were carefully selected
accounting for intersection geometry and traffic volumes. A total of 90 hours of video were
collected and processed in order to obtain cyclist and motor-vehicle trajectories and interactions.
After cyclist and motor-vehicle interactions were defined, ordered logit models with random effects
were developed to evaluate the safety effects of cycle tracks on interactions at intersections.
Among other results, it was found that intersection approaches with cycle tracks on the right are
safer than intersection approaches with no cycle track; however, intersections with cycle tracks on
the left compared to no cycle tracks were not found to have be significantly safer. The results
identify that the likelihood of a cyclist being involved in a dangerous conflicts increases with
increasing turning-vehicle flow and decreases with the size of the group of cyclists arriving at the
intersection.

Sohail Zangenehpour, Jillian Strauss, Luis F. Miranda-Moreno, Nicolas Saunier