基于上游单一检测器数据的高速公路事故影响分析

An Analysis of Freeway Crashes Based on the Single Upstream Loop Detector Data

为减少高速公路交通事故造成的拥堵及延误,利用上游单一检测器检测到的数据,根据交通波理论,对高速公路事故产生的交通波的传播与消散过程进行分析,利用每5 min断面速度变异系数对交通状态的特征点进行识别,进而确定事故的最长影响距离以及持续时间,并通过实际案例对该模型的效果进行分析.结果表明:该方法能很好地确定事故的影响范围,且与事故记录数据相比,能更准确地确定事故持续时间.

Freeway crashes often cause non-recurring congestion. Th e study on traffic impact of freeway crashes can help to improve the freeway crash management and reduce the congestion and delay. Based on the shockwave theory,this paper analyzes the propagation and dissipation of the shockwave generated by the freeway crashes. The breakpoint of the traffic state is identified by the coefficient of variation of the velocity of every 5 min in order to estimate the spatiotemporal extent of the delay caused by freeway crashes. The effect of the model is analyzed by a practical case. T he results show that the method can estimate traffic impacts of the crash well, and can more accurately determine the duration of the crash compared with the crash record data.