城市信号控制交叉口群路径关联度模型

Modeling Route Correlation Degree of Urban Signalized Intersection Group

为对交叉口群范围内具有强关联性的路径实施信号协调控制,提出了交叉口群路径关联度计算方法.该方法以避免由强关联性导致的交叉口排队溢流和绿灯空放等负面效应为目标,考虑交叉口群拓扑结构、各交叉口渠化形式与信号配时方案、交通流量、行程车速及车流离散等诸多因素,建立由离散性关联指标和阻滞性关联指标组成的交叉口群路径关联度计算模型.以滁州市区某交叉口群为例,计算各路径关联度值,确定信号协调控制对象,通过Synchro仿真比较协调前后交叉口群交通运行效益指标.结果表明,路径关联度计算方法能有效描述路径的关联特征,可为交叉口群交通信号协调控制奠定基础.

A method for the route correlation degree calculation is proposed to realize the traffic coordination control of the routes with a strong correlation in the intersection group. To avoid the detrimental effect such as spillback and starvation, the model Considers several influencing factors, namely, the topology of the intersections group, the channelization and timing plan for each intersection, flow distribution, travel speed, the dispersion of traffic platoons, etc. The route correlation model composes of dispersion index and retardation index. An intersection group in Chuzhou city of China is taken as a case study. The coordination objects are determined after the correlation degree for all the routes are obtained. The improvements of the traffic operation are validated by the Synchro simulation. The results show the proposed method can effectively descript the correlation characters of the routes in the intersection group, which lays foundations for traffic coordination control.