交叉口左转与直行车辆动态碰撞风险估计模型

Collision Risk Assessment Model Between Left-turn and Straight Vehicles at Intersections

为改善交叉口安全状况,提高整个交叉口的交通安全水平,对交叉口碰撞类型之一的左转与直行车辆动态碰撞风险估计模型及警告阈值进行了研究。分析了交叉口左转与直行车辆的运行过程并基于风险内涵,提出了左转与直行车辆的动态碰撞风险估计模型;运用Vissim微观交通仿真软件仿真输出的车辆运行数据计算碰撞风险估计值。仿真结果表明,根据碰撞风险估计值变化规律可以确定出左转与直行车辆的碰撞预警阈值。

In order to improve traffic safety at road intersections, a model for assessing the collision risk between left-turn and straight vehicles was proposed, and the warning threshold was also investigated. Based on analyzing the op- erating processes of left-turn and straight vehicles, an innovative, risk-based collision risk assessment model between left- turn and straight vehicles was developed. Simulated vehicle data from Vissim was used to estimate collision risk. The simulation results show that the warning threshold can be determined according to the discovered distribution of collision risk .