桥梁两端交叉口信号协调控制的优化设计

为提高桥梁两端交叉口的通行能力,减小桥面上车辆排队长度以及排队车辆的制动和启动对桥梁使用寿命的影响,以建瓯市水西大桥以及两侧的3个交叉口为研究对象,以排队长度、平均行程速度为目标评价指标,应用Synchro仿真软件对现有的信号协调控制方案进行分析与评价,并根据高峰时段的交通量和交通管理措施,采取"分时段、分方向"的信号协调控制优化策略,建立优化的信号协调控制系统。通过对比分析优化前后信号协调控制系统的交通效益指标,可知早高峰时段水西桥东西两端桥面上的排队长度分别缩短63.64%和52.94%,自东向西的平均行程速度提高20.48%,晚高峰时段桥面上的排队长度分别缩短56.52%和9.76%,自西向东的平均行程速度提高95.65%。

Optimal Design of Signal Coordination Control System for Intersections at Both Ends of Bridge

In order to improve the capacity of intersections at both -end of bridge , decrease the queue length on bridge , and re-duce the starting and braking ’ s adverse impact on the service life of a bridge , an example of Shuixi Bridge in Jianou City is given . With the application of “Synchro” for analysis and evaluation , the“different directions at different period” optimal signal coordination control systems are established according to Peak-hours’ traffic conditions and management measures .By comparison of traffic efficien-cy indicators before and after applying the optimal control , a significant improvement can be seen that the queue length at each side of Shuixi Bridge decreases by 63.64%and 52.94%respectively , the time mean speed of main control direction increases by 20.48%in morning peak-hours, and the reduction of queue length by 56.52%and 9.76%respectively, the time mean speed of main control di-rection increases by 95.65%in evening peak-hours.