交通运输工程与信息学报

城市道路是城市道路网中的重要节点,也是交通事故的多发点。因其交通组成和交通特性复杂,易造成车辆相互干扰和交通冲突。交通冲突严重性与交通事故发生可能性和严重性之间具有密切关系。因此,分析交通冲突严重性对于提高道路交叉口安全性具有实际意义。本文采用早高峰、平峰以及晚高峰三个时段的交通冲突数与混合当量交通量的比值(TC/MPCU)作为评价指标,并利用灰云模型建立交叉口交通冲突严重性分级评价方法,针对8个相似交叉口进行实例应用,结果表明该方法评价所得结果与交叉口实际交通状况接近,说明该方法有效可行。

Urban intersections are not only important nodes of urban road networks, but also a black spot because of their complicated traffic compositions and characteristics that cause vehicle interference and traffic conflicts. The severity of a traffic conflict is closely related to the likelihood and severity of a traffic accident. Therefore, it is of great significance to grasp the severity of traffic conflict for the analysis and improvement of intersection safety. In this study, the ratios of traffic conflict and mixed passenger car units(TC/MPCU) in three periods, namely morning peak hour, common hour and evening peak hour, are used as evaluation indexes, and a grading evaluation method for traffic conflict severity at urban intersections is established based on the grey cloud model. The proposed method is applied to assess the severity grade of traffic conflicts at eight similar intersections. The results show that the evaluation results generally improved in accordance with the actual conditions of the intersections. Thus, the proposed method can be proven both valid and feasible.