A coordinated design method and device for one-way signal on arterial lines in oversaturated traffic state

Abstract

The invention discloses a method and device for one-way signal coordination design of an arterial line in an oversaturated traffic state, wherein the method includes acquiring geometric parameters, traffic parameters, control parameters, and traffic flow data of a time period that needs to be optimized; Taking the main line as the modeling object, construct an optimization model aiming at maximizing the throughput of the main line, and realize the maximum throughput of the main line by adjusting the length of the green light; solve the model to obtain the time length of the green light of each intersection of the main line going straight and the branch line turning left; Each intersection is the modeling object, and an optimization model with the goal of minimizing the average vehicle delay is constructed, and the average vehicle delay is minimized by adjusting the phase difference; the phase difference between the intersection and its upstream intersection is obtained by solving the model. The present invention can effectively improve traffic capacity and service level of arterial intersections by establishing and solving a mixed integer linear programming model for maximizing throughput and a quadratic programming model for minimizing average vehicle delay.

Description

technical field [0001] The invention belongs to the field of traffic safety control, and in particular relates to a method and device for coordinating urban arterial signal design under oversaturated traffic conditions based on LWR (Lighthill Whitham Richards) shock wave theory. Background technique [0002] With the sharp increase in traffic demand, the problem of urban traffic congestion continues to intensify. Arterial roads undertake most of the traffic demand in the city, and often appear oversaturated during peak hours. Signal coordination control is an effective measure to maintain traffic order and improve traffic efficiency, and can effectively alleviate traffic congestion. The research on coordinated control of arterial lines under oversaturated traffic conditions is of great significance for improving the traffic capacity and service level of arterial lines. [0003] The LWR shock wave theory can often effectively estimate the queue length and delay at signalized...

AI Technical Summary

Problems solved by technology

Many studies have proposed signal control optimization schemes under oversaturated traffic conditions based on the shock wave theory, but there are still problems such as indirect optimization objectives and incomplete considerations: there are mutual influences and constraints among the intersections of arterial lines, and it is necessary to It is considered as a whole, and most of the existing studies focus on isolated intersections and adjacent intersections; the average vehicle delay is a decisive indicator for evaluating the service level of intersections, and the existing researches seldom use it as the direct target to optimize the control scheme; In the saturation situation, factors such as steering ratio, lane change, and vehicle entry into the branch road in the road section will all have an impact on the vehicle arrival situation, and existing studies have seldom considered these factors

Therefore, it can be considered that the adaptability of the existing technology to the control of the trunk signal in the oversaturated traffic state is insufficient

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