基于实测数据的城市快速路交通流特性研究

摘要

Fundamental diagrams,which reflect the relationship between volume,speed,and density,the tree key factors in traffic flow,is an important tool to explore the characteristic of traffic flow.Based on the empirical data of loop-detectors widely buried in Shanghai expressway,this paper carefully study the completeness,discreteness and patterns of fundamental diagrams of different sections.Results show that detecting locations have significant influence on the completeness and discreteness of fundamental diagrams.Meanwhile,specific patterns of fundamental diagrams are highly related to each other,and these patterns also correspond to specific traffic flow performance.%由交通流三参数速度、流量以及密度所构成的基本关系图是研究交通流内在运行特征的重要工具。以上海市城市快速路感应线圈数据为基础，通过对不同断面数据的集成计算，对基本图的完整性、离散型以及具体形态差异性进行了深入研究。研究发现，检测断面位置是造成部分快速路基本图数据缺失或离散性大的重要因素。同时，不同形态的流量－速度图与密度—速度图之间存在高度相关性，基本图形态与交通流运行状况之间也存在着一定的关联性。