A Method for Determining Critical Traffic State Parameters

Abstract

The invention provides a determining method for a threshold traffic state parameter. The determining method for the threshold traffic state parameter aims at solving the problems that the current calculation and the arrangement for the threshold traffic state parameter in urban roads are mostly based on human experience, and the consideration on various road conditions and traffic constitutions is lacked. The basic idea of the determining method for the threshold traffic state parameter is that by utilizing a lane basic traffic flow parameter obtained on a road segment; calculating to obtain traffic state parameters, namely speeds and time occupancy values, under the different traffic states on the road segment; establishing a Gaussian mixture model of the traffic state parameters; estimating to obtain the Gaussian mixture model under a smooth state and a congestion state through a model parameter; calculating to obtain a threshold traffic state value through the probability density function accumulated by the Gaussian model under the smooth state and the congestion state; and carrying out the discrimination on the traffic state of the road segment by utilizing the threshold traffic state parameters. According to the determining method for the threshold traffic state parameter, the insufficient parameter setting by the human experience is solved, the accuracy and pertinency of the discrimination of the road traffic state is comprehensively improved, and the scientificity of the traffic controlling level is improved.

Description

technical field [0001] The invention relates to a method for determining critical traffic state parameters, which is used for road traffic management and control and belongs to the field of intelligent traffic research. Background technique [0002] The critical traffic state parameter refers to a critical value used to classify the traffic state as smooth or congested. Scientifically and rationally determining the critical traffic state parameters under different road traffic environments will help traffic managers to fully understand the current traffic operation status, determine the goals of traffic control more reasonably, and deeply tap potential road traffic resources, so as to develop and adapt to local traffic conditions. Provide data support for the traffic control algorithm and optimization goals of the situation. The critical traffic state parameter is the critical value that characterizes the transition of the traffic operation state from smooth to congested, a...

AI Technical Summary

Problems solved by technology

However, due to the variability and randomness of the traffic state, different road conditions and traffic composition will have a great impact on the critical traffic state parameters, thereby affecting the effect of traffic control

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