Basic traffic flow parameter based automatic identification method for traffic congestion states

Abstract

The invention discloses a basic traffic flow parameter based automatic identification method for traffic congestion states. The method comprises the steps of determining traffic state characteristic threshold values and judging real-time traffic states, wherein firstly, characteristic threshold values of free-flowing, congestion and blockage are determined through normal fitting of the traffic flow and the occupancy phase angle tangent value, and self correction of threshold values can be conducted according to changes of traffic states; and secondly, real-time traffic states are judged through calculation of the distribution of fitted values of real-time traffic flow phase angle characteristic values according to continuous twice real-time traffic volumes. The method has the advantages that three important basic parameters of the traffic flow, such as the flow, the speed and the occupancy, serve as evidences for judgment of traffic states, the problem that traffic states of city roads at rush hours are difficult to judge correctly, and traffic conditions comprise the free-flowing state, the congestion state and the blockage state. By the aid of the method, the reaction speed for emergencies can be accelerated, and suggestions on selection of traveling routes are provided for travelers.

Description

technical field [0001] The invention relates to an automatic identification method of road congestion state based on basic traffic flow parameters, which is used for real-time identification of road traffic state. Background technique [0002] It is of great significance to correctly understand and objectively evaluate urban traffic congestion and clarify the actual situation of traffic congestion, which is the basic work for in-depth analysis and solution of traffic congestion. [0003] Foreign traffic management departments and research institutions have carried out a lot of research on traffic congestion evaluation, mainly in the United States, Europe, Japan and other countries. Among them, the United States was the first to carry out the research and practice of systematic traffic congestion evaluation index system, and established a relatively complete congestion evaluation index system; Europe, Japan and other developed countries and regions have also carried out relat...

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Problems solved by technology

Therefore, the use of flow rate as a single discriminant parameter ca

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