交通流理论与服务水平

Traffic Flow Theory and Level of Service

提出了新的交通流连续性假设,引入了车域和定常交通流的概念,重新定义了交通流的动量,调整了交通流与流体流的比拟关系.以此为基础,建立了交通流的欧拉方程和考虑粘性的运动微分方程,得出了广义交通压力的定义.联立解连续性方程和考虑粘性的运动微分方程,得到了交通流参数之间的关系.提出了以量纲一交通压力评价道路服务水平的指标体系.最后,采用广州至深圳及广州至佛山高速公路实测数据对研究结果进行了验证.

A new traffic flow continuity hypothesis is first proposed in this paper with the introduction of the concept of vehicle field. The momentum of traffic flow is redefined while the assimilating relationship between traffic flow and fluid flow is adjusted. In addition, traffic flow Euler＇ s equation and viscosity momentum differential equation are established. With a combined analysis of continuum equation and viscosity momentum differential equation, relationships among traffic parameters are made clear. Also, the paper presents a performance measuring system for evaluating the level of service （LOS） of road with non-dimensional traffic pressure. Finally, the field data observed on Guangzhou-Shenzhen freeway and Guangzhou- Foshan freeway in China are used to verify the results.