全设置连续流交叉口信号配时及延误模型

To solve the problem of vehicles having to stop several times in continuous flow intersections, this paper proposes an optimal control strategy for the vehicles moving along each flow direction that eliminates stopping at the second stop line. On coordinating the timing of the main pre-signal and adjusting the signal control phase sequence scheme, a vehicle can directly pass through the second stop line, so that the number of left-turn vehicle stops is reduced from 3 to 2 or even 1; consequently, the number of straight vehicles stops can be reduced from 2 to 1. This study analyzes the arrival and departure patterns of vehicles along each flow direction, constructs a delay calculation model for left-turn traffic flow at the third stop line, and develops an overall delay calculation model for continuous flow intersections by incorporating the Webster classic model. The calculation results are essentially consistent with the VISSIM simulation results. In this study, the constraints that need to be satisfied by factors such as no second stops of vehicles, no collisions of vehicles, and traffic organization for continuous flow intersections are derived. Moreover, a control optimization model for the coordinated timing control of the main pre-signal in continuous flow intersections is developed. Considering the minimum delay of vehicles at intersections as the optimization goal, four traffic scenarios are designed to verify the improvements in efficiency under different conditions. The results indicate that, on eliminating one stop, the average vehicle delay and the average number of stops can be reduced by more than 50%. Thus, choosing an appropriate lane allocation scheme considering the proportion of each turning traffic volume can help improve the traffic efficiency of continuous flow intersections. Under the two strategies, the average numbers of vehicles stops at the intersection are 0.88~1.05 and 0.59~0.77, respectively; these values are approximately two times lower than the average number of vehicle stops under the existing control strategy. The results of this research provide a new perspective for the control of traffic at continuous flow intersections and are also expected to result in significant improvements in intersection traffic efficiency.