Safety Impact Factor Analysis at Intersections with Left-Turn Waiting Areas Based on Ordered Logit Model

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Safety Impact Factor Analysis at Intersections with Left-Turn Waiting Areas Based on Ordered Logit Model

Li, Mengying / Cheng, Lin / Xu, Guoshan / Zhang, Guopeng

In recent years, many cities have set up the left-turn waiting areas (LWA) at intersections. It not only improved the operation efficiency of intersections but also have impacted traffic safety performance. This paper focused on the characteristics of traffic conflicts at intersections with LWA and analyzed various factors affecting safety performance of LWA. The traffic conflict severity and traffic conflict frequency were used to identify the safety performance of intersections. The ordered logit model was built to find out the factors which have significant impacts on traffic safety at intersections with LWA. Results showed that the capacities of LWA, secondary conflicts, rear-end conflicts, confluence conflicts, clearance between vehicles, the left-turn traffic volumes, the numbers of receiving lanes, turning left in advance, and the types of left-turn phase have significant impacts on intersection safety with LWA. Finally, some management recommendations are put forward to improve the safety.