两相位交叉口直左机动车冲突数模型研究

Research on Conflict Number Calculation Model of Straight and Left-turning Motor Vehicles at Two-Phase Intersection

为研究两相位信号控制交叉口机动车的冲突情况,以直行与对向左转机动车为研究对象,建立绿灯初期和绿灯后期两个时间段直行与对向左转车辆之间的冲突数计算模型,并以长春市典型两相位信号控制交叉口为例,验证模型的有效性。结果表明:文章推导出的冲突数计算模型,可根据绿灯初期及后期不同冲突状况以及机动车数量,计算出两相位交叉口每个信号周期内绿灯初期及后期的直行与左转机动车冲突数;通过标定冲突相关系数,绿灯初期和后期相关系数分别为0.82、0.80,早晚高峰冲突数平均误差分别为5.89%、8.77%,相关性较强,具有较高的适用性。研究成果可为改善交叉口安全评价及其控制策略提供参考。

In order to study the conflict situation of vehicles at two-phase signal controlled intersections,a calculation model for the number of conflicts between straight and opposite left turning vehicles at the early and late green light periods is established.This paper takes a typical two-phase signal controlled intersection in Changchun as an example to verify the effectiveness of the model.The results show that the conflict number calculation model proposed in this paper can calculate the conflict number of straight and left turning vehicles at the beginning and the end of each signal cycle of the two phase intersection according to the different conflict situations and the number of vehicles at the beginning and the end of the green light periods.By calibrating the correlation coefficient of conflict,the correlation coefficients at the beginning and the end of the green light are 0.82 and 0.80 respectively,and the average errors of the number of morning and evening peak conflicts are 5.89%and 8.77%respectively.The correlation is strong and the applicability is high.The research results can provide reference for improving intersection safety evaluation and control strategies.