Abstract
Road safety remains a critical concern in Canada and worldwide. In response, roundabouts have emerged as a safer intersection design under certain road, traffic and environmental conditions, with extensive research highlighting the critical role of geometric design in their safety effect. However, such geometric effects remain relatively unexplored in Canada, where roundabouts are a recent addition. Moreover, it is unknown whether the underlying relationship varies over time due to the evolution in driver behaviour. This study attempts to address these questions by utilizing data from the Region of Waterloo and constructing negative binomial models. Results indicate that geometric design significantly impacts collision frequency, with effects generally consistent but showing some temporal variability. The study also highlights unique relationships between geometries and safety in Canada, advocating for tailored roundabout designs and cautioning against direct application of findings from other regions.
Published Version
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