Through the analysis of driving behaviors and conflict characteristics of non-motorized vehicles (NMVs) in the urban mixed-traffic environment, this paper proposes a severity-level determination procedure for non-motorized traffic conflicts, including a determination of the conflict decision point, a judgment of the conflict seriousness and the drawing of the cumulative frequency curves in order to obtain the conflict severity threshold. Two intersections, Renmin-Ledu and West Xianxia-Jianhe in Shanghai, are examined to demonstrate the feasibility of the proposed method. In this study, approximately 220 valid samples for each intersection are collected by three observers through video surveillance. Results show that there are no significant differences of severity threshold values between NMV-NMV and NMV-MV (motorized vehicle) conflicts; both have times of about 0.6s with the average misjudgment rate of 11%. To enhance the safety level of NMVs, this paper proposes that the low-limit threshold value be 0.8s to 1.0s when considered in the safety analysis of intersection planning, design and operation.
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