Cycle lanes: their effect on driver passing distances in urban areas

Stewart, Kathryn; McHale, Adrian · 2014 · DOAJ

DOI: 10.3846/16484142.2014.953205

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Summary

This study investigates the impact of cycle lanes on driver passing distances in urban environments, addressing contradictory evidence in existing literature regarding whether such infrastructure improves or compromises cyclist safety. While previous research suggested that cycle lanes might encourage closer overtaking on higher-speed roads, this paper focuses specifically on urban settings (30–40 mph zones) to determine if the presence and color of cycle lanes significantly influence the lateral space drivers provide when overtaking cyclists. The research aims to identify whether cycle lane presence is a primary determinant of passing distance or if other environmental and behavioral factors are more significant. The methodology employed an instrumented bicycle equipped with two cameras: a rear-facing camera calibrated with a graduated scale to measure overtaking distances up to 2.5 meters, and a forward-facing camera to record traffic conditions, vehicle types, and road features. Data was collected at 14 sites in Edinburgh, UK, between October and November 2010. The study selected sites with varying characteristics, including roads with no cycle lanes, uncoloured advisory lanes, and coloured advisory lanes, ensuring comparable widths and traffic flows where possible. Statistical analyses, including F-tests, t-tests, and ANOVA, were conducted to compare mean overtaking distances and variances across different site configurations, controlling for variables such as opposing traffic. The results indicate that the presence of a cycle lane is not the most significant factor determining overtaking distance in urban mid-block scenarios. Instead, three variables were identified as most significant: absolute road width, the presence of nearside parking, and the presence of an opposing vehicle during the overtaking maneuver. Specifically, when comparing sites with no cycle lanes to those with uncoloured lanes, a statistically significant increase in mean overtaking distance (0.16 m) was observed, but this difference diminished when controlling for opposing traffic. Comparisons between uncoloured and coloured cycle lanes, or between no lanes and coloured lanes, showed no statistically significant differences in mean passing distances. The study also found a larger unknown factor influencing driver behavior, postulated to be driver-specific variables such as local driving culture, congestion levels, or time-of-day frustration, which are difficult to quantify. The significance of these findings lies in challenging the assumption that cycle lane provision alone dictates driver passing behavior. The study suggests that traffic planners should prioritize absolute road width and parking management over the mere presence of cycle lanes to ensure safe overtaking distances. Furthermore, the results highlight the complexity of driver behavior, indicating that psychological and contextual factors play a substantial role in road safety outcomes. This implies that infrastructure design must account for broader environmental conditions and driver psychology rather than relying solely on lane markings to mitigate risk.

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• cyclist safety