Method for time designing and optimizing left turn phase of signalized intersection

Abstract

The invention discloses a method for time designing and optimizing a left turn phase of a signalized intersection, wherein the calculation formulas of traffic capacity and delay under two conditions whether the intersection has a left turn special phase are put forward. Based on the traffic data obtained through a survey, the bases of settings of the left turn special phases at signalized intersections of urban roads are provided by comprehensively evaluating the operation of intersections and combining with the critical condition of the settings of the left turn special phases. By comparing the evaluation criteria of setting the left turn special phase, the intersection of the front and the back, the queue length and the like, the optimization effect is determined, so as to improve the traffic efficiency of the intersection. By comparing the evaluation criteria of the delay before and after setting the left turn special phases, the intersection of the front and the back, the queue length and the like, the optimization effect is determined so as to improve the traffic efficiency of the intersections. Through the reasonable design, the method for time designing and optimizing the left turn phase of the signalized intersection can effectively reduce the delay of the whole intersection and improve the service level of the intersection which has a larger traffic flow of left turn cars.

Description

technical field [0001] The invention relates to a design and optimization method for a left-turn phase at a signalized intersection. Background technique [0002] With the rapid development of my country's national economy and the advancement of urbanization, the number of cars owned by residents in my country has increased rapidly, and the traffic volume of my country's urban roads has also risen sharply, followed by increasingly serious traffic congestion, frequent traffic accidents, and Noise pollution and air pollution intensified. In particular, road traffic safety issues have attracted more attention. [0003] The reasons for the above-mentioned traffic problems on urban roads in my country mainly include the following aspects: (1) The speed of road traffic infrastructure construction cannot keep up with the growth rate of traffic demand, which is the direct cause of road traffic congestion in large cities; It does not meet the needs of the development of urban traffic...

AI Technical Summary

Problems solved by technology

[0014] 2. Vehicle delays without special left-turn phases

[0019] (3.l) Delay in acceleration and deceleration, that is, the delay caused by the acceleration and deceleration of the left-turning vehicle at the stop line or at the conflict point;

[0020] (3.2) Response delay, that is, the delay caused by the driver observing the traffic flow inside the signalized intersection in order to ensure safety;

[0021] (3.3) Delay at the intersection point, that is, the left-turning vehicle needs to merge with the vehicle traveling in the same direction after passing the conflict point, and the time loss caused by waiting to give way

However, in terms of intersection phase design and index evaluation, there is still a lack of systematic methods. Therefore, this study rationally adopts left-turn phase design and optimization from the perspective of improving the traffic capacity of intersections and reducing delays. method

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