Analysis of the factors influencing the severity of straight-left conflicts under left turn permit phase

Jiping Shen; Weifeng Jin

doi:10.1117/12.3024121

14 February 2024 Analysis of the factors influencing the severity of straight-left conflicts under left turn permit phase

Jiping Shen, Weifeng Jin

Author Affiliations +

Proceedings Volume 13018, International Conference on Smart Transportation and City Engineering (STCE 2023); 130180C (2024) https://doi.org/10.1117/12.3024121
Event: International Conference on Smart Transportation and City Engineering (STCE 2023), 2023, Chongqing, China

Abstract

With a permitted left-turn phase, left-turning vehicles irregularly change speed and trajectory to compete for the right of way with straight vehicles approaching from the opposite direction, which brings serious safety hazards to intersection operation. The data collected from three intersections in the high-tech development zone of Xi'an city, and the turning behaviors of left-turning vehicles were classified into three patterns: "no-interference, yield, and rush" based on the interactions between the left-turning vehicles and the straight vehicles approaching from the opposite direction. This study took post encroachment time as the quantitative indicators of the conflict severity, which was classified into 4 levels and the disordered logistic regression model was established to identify the significant factors affecting the conflict severity. The results showed that: the conflict severity of the left-turning vehicles in rush pattern is higher than that in yield pattern. The odds ratio of that the conflict severities were medium, serious conflict respectively increased to 11.598 and 3.348 when the vehicles in rush pattern. The arrival speed of the left-turning vehicles and signal phase were significant factors increasing the severities of conflicts, and the average speed difference and average headway are protective factors. The results of this study can provide a reference for traffic management departments to optimize traffic control schemes.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Jiping Shen and Weifeng Jin "Analysis of the factors influencing the severity of straight-left conflicts under left turn permit phase", Proc. SPIE 13018, International Conference on Smart Transportation and City Engineering (STCE 2023), 130180C (14 February 2024); https://doi.org/10.1117/12.3024121

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KEYWORDS

Safety

Positron emission tomography

Roads

Factor analysis

Image processing

Design

Diagnostics

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