Abstract
When the right-turn vehicles share the same phase with pedestrians on divided lanes at intersection, the stopped buses or medium-size vehicles that closed to the right-turn vehicles would block the view of drivers and pedestrians from the far-side of crosswalk. This paper aims at analyzing the changes of lag/gap acceptance behavior with/without considering sight obstruction and the headway of following right-turn vehicles by video observation. Cumulative Weibull distribution function was used to estimate parameters of lag/gap acceptance probabilities. The result showed that right-turn drivers tend to accept a smaller lag/gap with restricted sight, and it would lead to more potential conflicts between right-turn vehicles and pedestrians. However, larger headway of following right-turn vehicles with sight obstruction may result in delay and reduced capacity in right-turn lanes. This study will hopefully improve the understanding of the relationship between visibility and pedestrian-vehicle conflicts.
Highlights
Critical situations such as vehicle-pedestrian conflicts at signalized intersection are complex and serious, especially when pedestrians share the same phase with right-turning vehicles
Based on the video-recording analysis, 449 accepted lags/gaps were observed without sight obstruction and 115 accepted lags/gaps were observed with sight obstruction
This study aimed to analyze the effect of the restricted sight on traffic safety between vehicles and pedestrians
Summary
Critical situations such as vehicle-pedestrian conflicts at signalized intersection are complex and serious, especially when pedestrians share the same phase with right-turning vehicles. It draws significant attention by many scholars. At a signalized intersection without protected rightturn phase, right-turning vehicles and pedestrians have to share the same phase. Cooper and Zheng used logistic regression method to analyze “sequence” gap acceptance between distracted and not distracted [6]. Alhajyaseen et al [9] proposed Cumulative Weibull distribution to analyze the lag/gap acceptance between leftturn vehicles and pedestrians. It was found that the Cumulative Weibull distribution would overcome the mathematical problems brought by the aforesaid models
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