Supersaturated traffic state trunk line one-way signal coordination design method and device

Abstract

The invention discloses a supersaturated traffic state trunk line one-way signal coordination design method and device. The method comprises the steps: obtaining geometrical parameters, traffic parameters and control parameters of a supersaturated traffic state trunk line target road section and traffic flow data of a time period needing to be optimized; taking the trunk line as a modeling object,constructing an optimization model taking maximization of the trunk line throughput as a target, and realizing maximization of the trunk line throughput by adjusting the green light duration; solvingthe model to obtain the trunk line straight going and branch line left-turn phase green light duration of each intersection of the trunk line; taking each intersection of the trunk line as a modelingobject, constructing an optimization model taking minimization of vehicle average delay as a target, and realizing minimization of the vehicle average delay by adjusting the phase difference; and solving the model to obtain the phase difference between the intersection and the upstream intersection. According to the method, the mixed integer linear programming model with the maximum throughput and the quadratic programming model with the minimum vehicle average delay are established and solved, so that the traffic capacity and the service level of the trunk line intersection can be effectively improved.

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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