基于期望运行轨迹的车道变换行为安全性分析

Study on the Safety of Lane-changing Based on Virtual Desire Trajectory

为解决车道变换行为对交通运行安全影响的定量分析难题,基于车辆和驾驶员行为特性,构建车道变换行为期望运行轨迹,提出基于缓和曲线的轨迹形式,并结合车道变换行为引发的4种碰撞形式,在车辆运行纵向和横向分别构建安全运行判断方程和安全运行限制方程,分析安全距离对运行速度和车辆侧向加速度梯度的敏感度,给出车道变换行为安全运行判断方程的应用案例。研究结果表明,侧向加速度的变化梯度直接影响车道变换的安全性。

In order to solve the quantitative analysis problems of lane-changing influence on traffic safety, a Virtual Desire Trajectory of lane-changing is constructed based on the vehicle and driver＇ s behaviorcharacteristics. By combining 4 types of collisions caused by lane-changing, a safe operation judgment equation and restriction equation are respectively built in the vertical and horizontal direction. And the sen-sitivity of vehicle speed and lateral acceleration gradients to lane-changing safety is analyzed. Finally, an application example is given. This study shows that the changes of the lateral acceleration gradient have adirect impact on the safety of lane-changing.