Mechanism Analysis and Optimization of Signalized Intersection Coordinated Control under Oversaturated Status

Abstract

How to relieve the congestion of intersection is a long-standing problem. The problem gets even more difficult when intersection is under oversaturated conditions. For the purpose of improving traffic signal control at oversaturated intersection and avoiding the deadlock of intersection, a coordination control model under oversaturated condition is established by using the traffic shockwave theory, which is based on the research of queue spillback types and shockwave profile of traffic flow in intersection, this control model constraints the form of queue spillback into particular type, and keeps the capacity matching between upstream and downstream intersections at the same time. The calculation method of the coordination control model is presented as well. At last, a simulation experiment is conducted to test the effectiveness of this model. The simulation results prove the effectiveness of this model, it shows that the coordination control scheme based on this model can reduce the average delay of vehicles by 24.6%, and decrease the risk of intersection deadlock by 30%, this strategy can also improve the tolerance and reliability of intersection significantly under oversaturated condition.