Method for determining influence range of urban road traffic accident based on fixed detector

Abstract

The invention discloses a method for determining the influence range of an urban road traffic accident based on a fixed detector, which relates to a method for determining the influence range of a traffic accident after the traffic accident happens on an urban road network completely consisting of signal-controlled crossings. The method specifically comprises the following steps: calculating the arrival rate of vehicles on an approach of a crossing; detecting the departure rate of the vehicles on the crossing; calculating the queue length based on the fixed detector; analyzing the diffusion process of congestion caused by the traffic accident; and finally determining the influence range of the traffic accident. By the invention, the real-time and accurate prediction on the influence range of the traffic accident can be achieved, thereby achieving the purpose of improving the implementary efficiency of measures for rapidly disposing the traffic accident. The method is simple and practical and has higher real-time property and accuracy.

Description

technical field [0001] The invention relates to calculating the queue length according to the fixed detectors arranged on the road section after a traffic accident occurs on an urban road, and determining the influence range of the traffic accident according to the diffusion process of the congestion caused by the traffic accident. provide a basis for the implementation of the measures. The utility model belongs to the field of urban road traffic control. Background technique [0002] Frequent traffic accidents on urban roads will not only cause casualties and property losses, but also cause traffic congestion, reduce the operating efficiency of the road network, and even induce secondary accidents. An effective way to reduce the negative impact of traffic accidents is to calculate the impact of accidents in real time and take targeted measures to deal with traffic accidents in a timely manner. Some studies have been carried out on the impact diffusion of traffic accidents...

AI Technical Summary

Problems solved by technology

Some studies have been carried out on the impact diffusion of traffic accidents at home and abroad, but the existing research has some shortcomings and cannot be effectively applied to urban roads, mainly including the following aspects: (1) Most of the studies on the diffusion mechanism of traffic accidents in urban roads Drawing on the relevant theories of highway traffic, urban traffic is mostly controlled by signals, and its traffic flow form is relatively complex, which cannot be analyzed simply as a continuous flow. It is necessary to introduce a new arrival flow model to accurately calculate the queue length; (2) it is generally considered that after the traffic accident is resolved , the departure rate of vehicles is equal to the maximum capacity of the road, but this is not the case; (3) It is generally believed that the congestion spreads to the intersection, and the intersection immediately falls into a deadlock state, and the congestion quickly spreads to other connecting sections of the intersection. The theory is more consistent with non-signalized intersections. Signaled control has a certain regulatory effect on congestion diffusion. The intersection will not immediately fall into a deadlock state. The congestion diffusion process is different from that of non-signalized intersections.

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