防止短连线交叉口溢流的单点信号配时优化

从我国城市交叉口的交通特征出发，在考虑排队长度和行人过街约束条件下构造了多目标规划函数：优化目标是使车辆平均延误和各相位关键车道组饱和度方差最小，约束条件是排队长度不超过车道预设长度，并且行人过街相位足够长. 对于多目标规划，采用功效系数法建立目标评价函数. 通过天河北与天寿路交叉口实例应用遗传算法求解验证模型，结论表明：该模型能够有效地防止短连线交叉口溢流现象的发生.

Optimization on signal timing for preventing urban isolated intersection which contains short sections from overflowing

From the analysis of traffic's characteristic of China's urban intersections and considering the constraints of queue length and pedestrians cross the street, a multi-objective programming function is constructed to minimize not only the vehicle average delay but also the mean square value of saturations of car flows of all phases. The constraints are that the queue length is not more than the driveway default length and the pedestrians cross the street phase is long enough. The efficacy coefficient method is used to formulate an evaluation function that covers all objective functions of the original problem. An example of Tianhebei road and Tianshou road intersection validated the model and the evaluation function was optimized by genetic algorithm. The results show that the model can prevent urban isolated intersection which contains short sections overflow effectively.