Phase Optimization of Arterial Coordinated Control

In the system which is about to actualize coordinated control, because of the bottleneck of coordinated control, the bidirectional coordinated control can't take into effect. In this paper, based on the three parameters of traffic control, the author introduces a model of phase sequence optimization- setting single-direction passing through model for one or some intersections in the system which is about to actualize coordinated control. The upstream and the downstream can go through single-direction passing through intersections at staggered time. According to phase sequence optimization, comparing to classic ideal signal model, 4 phases can be staggered. It equals to an increase of 4 ideal signal locations, and it can greatly short the ideal signal distance. If the phase circle is close to each other, the ideal signal distance under this model is a quarter of that under the classic model. Under the classic model, the maximal value that the actual intersection deviating from the ideal signal location is 1/2 of (isolated coordinated phase) ideal signal distance. Accordingly, the maximal time difference between the vehicle arriving time and the beginning time of corresponded coordinated phase is c/2. Under the model brought in this paper, the maximal time difference between the vehicle arriving time and the beginning time of corresponded coordinated phase is c/8. The bottleneck of coordinated control is expanded and the width of green band is improved significantly. In this paper the author uses bidirectional non-constant model to calculate ideal signal distance.