重载公路信号交叉口车辆跟驰特性及折算系数

为研究重载公路信号交叉口处不同车型车辆跟驰行为的差异，调查获取自然驾驶条件下某重载公路信号交叉口通行车辆的跟驰数据，分析各车型车辆的跟驰特性。结果显示：绿灯启亮后，重载公路信号交叉口的车辆加速非常缓慢，车流长期处于加速阶段，几乎无法在绿灯期间达到稳定车速；此外，在跟驰过程中，车辆车间时距随车型变化差异显著，随车速变化差异不明显。基于以上发现，并考虑不同运行阶段车流运行特性的差异，分别对容量计算法和车头时距法进行改进，利用实测数据计算得出重载公路信号交叉口加速阶段和稳定阶段的车辆折算系数。

Research on vehicle-following behavior and passenger car equivalent at signalized intersections of heavy traffic highway

In order to study the differences of following behavior of different vehicle types at signalized intersection of heavy traffic highway, this paper investigates four separate signalized intersections at a heavy traffic highway and obtains vehicle-following data under natural driving conditions. The results indicate that after the green light is turned on, vehicles at signalized intersections of the heavy traffic highway accelerate very slowly. Traffic flow is constantly accelerating and it is almost impossible to reach a steady speed during green lights. It is also showed that in the process of following, the time from the tail of front vehicle to the head of rear vehicle varies obviously with the change of vehicle type, but not with the change of vehicle speed. Based on these findings, considering the difference of traffic flow characteristics in different running stages, this paper calculates passenger car equivalents for acceleration stage and stability stage at signalized intersection of heavy traffic highway respectively on the basis of improved capacity method and time headway method.