快速路入口匝道连接段交通熵特性

Traffic entropy characteristics at on-ramp junctions on urban freeway

针对以往研究中大多运用车辆当量换算方法来描述混合交通流的性能,无法取得良好效果的问题,采用基于车头时距的方法来计算车辆当量换算系数,并在此基础上,研究了城市快速路入口匝道连接段交通熵的特性以及交通量与车辆行驶平均速度、交通熵的非线性关系。研究结果可为城市快速路入口匝道连接段交通流特性分析、通行能力计算和服务水平分析提供参考。

Most of the previous studies using the standard vehicle equivalent（SVE） method to describe the mixed traffic flow performances, but had failed to achieve good results. SVE was calculated by the method of average headway, and the traffic entropy characteristics and the nonlinear relations between the traffic volume and the average travel speed, the traffic entropy were studied on the urban freeway on-ramp junctions. The results may be useful for analysis of the traffic flow characteristics, the capacity calculation and the service level analysis on the urban freeway on-ramp junctions.