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 post encroachment time as a surrogate measure of the interactions between cyclists and turning vehicles 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.<\/p>\n
Au cours des derni\u00e8res ann\u00e9es, les villes d\u2019Am\u00e9rique du Nord ont construit des pistes cyclables dans l'intention de fournir aux cyclistes des am\u00e9nagements plus s\u00fbrs. Ces am\u00e9nagements ont \u00e9t\u00e9 construits et se sont r\u00e9pandus, mais tr\u00e8s peu d\u2019\u00e9tudes ont \u00e9t\u00e9 men\u00e9es sur l'impact des pistes cyclables sur la s\u00e9curit\u00e9, notamment aux carrefours, o\u00f9 les cyclistes interagissent avec les v\u00e9hicules motoris\u00e9s qui tournent. Certaines \u00e9tude de s\u00e9curit\u00e9 ont examin\u00e9 les blessures et ont trouv\u00e9 des impacts positifs des pistes cyclables sur la s\u00e9curit\u00e9. L'objectif de ce travail est d'\u00e9tudier les effets des pistes cyclables sur la s\u00e9curit\u00e9 aux carrefours \u00e0 l'aide d'une \u00e9tude avec groupe de contr\u00f4le. A cet effet, une m\u00e9thode utilisant l\u2019analyse vid\u00e9o est propos\u00e9e pour analyser le temps de post-empi\u00e9tement (PET) comme mesure substitut de s\u00e9curit\u00e9 des interactions entre les cyclistes et les v\u00e9hicules tournant qui circulent dans la m\u00eame direction. La ville de Montr\u00e9al sert de cas d'\u00e9tude : un \u00e9chantillon de carrefours avec et sans pistes cyclables sur les c\u00f4t\u00e9s droit et gauche a \u00e9t\u00e9 soigneusement choisi en tenant compte de la g\u00e9om\u00e9trie et des d\u00e9bits des carrefours. Un total de 90 heures de vid\u00e9o a \u00e9t\u00e9 collect\u00e9 et trait\u00e9 afin d'obtenir les trajectoires et interactions des cyclistes et des v\u00e9hicules motoris\u00e9s. Une fois les interactions entre cyclistes et v\u00e9hicules motoris\u00e9s identifi\u00e9es, des mod\u00e8les logit ordonn\u00e9s \u00e0 effets al\u00e9atoires ont \u00e9t\u00e9 estim\u00e9s pour \u00e9valuer les effets des pistes cyclables sur la s\u00e9curit\u00e9 des interactions aux carrefours. Les r\u00e9sultats montrent entre autre que les approches des carrefours avec des pistes cyclables sur la droite sont plus s\u00fbres que les approches des carrefours sans piste cyclable; toutefois, aucune diff\u00e9rence n\u2019a \u00e9t\u00e9 trouv\u00e9e entre les approches aux carrefours avec des pistes cyclables sur la gauche par rapport aux approches sans pistes cyclables. Les r\u00e9sultats mettent de plus en \u00e9vidence que la probabilit\u00e9 qu'un cycliste soit impliqu\u00e9 dans un conflit dangereux augmente avec le d\u00e9bit du flux tournant de v\u00e9hicules et diminue avec la taille du groupe de cycliste arrivant au carrefour.","protected":false},"excerpt":{"rendered":"
Sohail Zangenehpour, Jillian Strauss, Luis F. Miranda-Moreno, Nicolas Saunier
\nStudent Paper Competition: 1st Place<\/span><\/p>\n","protected":false},"author":163,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_post_transparent":"default","_kad_post_title":"default","_kad_post_layout":"default","_kad_post_sidebar_id":"","_kad_post_content_style":"default","_kad_post_vertical_padding":"default","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[100,346],"tags":[],"class_list":["post-18569","post","type-post","status-publish","format-standard","hentry","category-2015-carsp-conference-acpser-ottawa","category-research-and-evaluation"],"acf":[],"_links":{"self":[{"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/posts\/18569","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/users\/163"}],"replies":[{"embeddable":true,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/comments?post=18569"}],"version-history":[{"count":4,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/posts\/18569\/revisions"}],"predecessor-version":[{"id":20664,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/posts\/18569\/revisions\/20664"}],"wp:attachment":[{"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/media?parent=18569"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/categories?post=18569"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/tags?post=18569"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}