Research Papers

A Methodology for the Analysis of Cyclist Injury Occurrence at Signalized Intersections

Filename 1B-Jillian-Strauss.pdf
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Version 1
Date added May 8, 2011
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Category 2011 CMRSC XXI Halifax
Tags Session 1B
Author/Auteur Jillian Strauss, Luis F. Miranda-Moreno

Abstract

By their very nature, signalized intersections create many interactions between motor-vehicles, cyclists and pedestrians which all play a role, to different degrees, in cyclist injury occurrence. This research uses a sample of 753 signalized intersections on the island of Montreal and seeks to (i) propose a method for estimating annual average daily bicycle volumes passing through them. This involves developing a model that can correct not only for the day of the week and month of the year but also for hourly weather conditions and (ii) develop frequency occurrence models for cyclist injuries at signalized intersections by proposing and evaluating different risk exposure measures, completely aggregated flows, motor-vehicle flows aggregated by movement type and potential conflicts between motor-vehicles and cyclists, and considering both geometric design and built environment characteristics. A simple weather model was identified which describes the relative changes in both temperature and humidity as well as the presence of precipitation and their effects on ridership. A 10% increase in temperature would result in a 1.9% increase in ridership whereas a 10% increase in humidity would cause ridership to decrease by 6.5%. Furthermore, the presence of precipitation would cause a much larger decline in cycling activity. Several negative binomial models were fitted to the data, applying different risk exposure measures as well as some design and built environment characteristics. Among the results, this study shows that cyclist collisions are sensitive to changes in cyclist and motor- vehicle flows. A 10% increase in bicycle flow is associated with a 4.1% increase in the frequency of cyclist injuries. Total motor-vehicle flows are significant however, when motor-vehicle flows are considered based on movement type, it becomes apparent that right-turn and left-turn movements have greater effects on injury occurrence than through movement vehicles. When potential conflicts are considered, right turns, left turns and through conflicts all have an effect on cyclist injuries. It was also found that the number of bus stops in the proximity of intersections increases cyclist injury occurrence.

Jillian Strauss, Luis F. Miranda-Moreno