基于车辆轨迹重构的信号交叉口延误提取研究

通过信号交叉口设置的监控设施，获取停车线前f 辆车的相关信息，以其为分析数据源，重构车辆运行轨迹，提取信号交叉口的延误参数. 对于轨迹重构中车辆运行时减速、停车、启动，以及恢复正常行驶速度等关键时间点的确定方法为：借助前f 辆车的停车时间信息和车辆到达概率分布函数，确定后续车辆的停车时间；结合车辆减速过程满足的双曲正弦函数，确定经历排队车辆的减速时间点；以前f 辆车的启动时间为输入，借助饱和车头时距，计算车辆启动时间点；根据车辆加速满足的匀变加速过程，确定车辆恢复正常行驶速度的时间点. 最后，通过实际车辆轨迹数据验证了该方法的精度.

Delay Extraction Based on Vehicle's Trajectory Reconstruction at Signalized Intersection

Taking the first f- th vehicles' information under the monitoring camera facility at the signalized intersection as the data input, this paper reconstructs the trajectory of the vehicles, and extracts the delay information. The calculation method on the key time points in the vehicle's trajectory reconstruction, including the initial deceleration time, stopping time, start-up time and recovery time, is described as follows. With the first f-th vehicles' stopping time and the vehicle's arrival distribution function, the following vehicle's stopping time can be deduced; with the vehicles' deceleration procedure fitted as the hyperbolic sine function, using this function and the stopping time, the deceleration time can be calculated; using the first f-th vehicles' start-up time and the saturation headway, the following vehicle's start- up time can be determined; and using the uniform variable acceleration procedure, the recovery time can be calculated. Lastly, the accuracy of the method has been verified through the real vehicle's trajectory data.