过饱和状态下交通控制小区动态划分方法

控制系统对过饱和状态作出迅速响应首先要确定与过饱和路段相关联的交通控制小区的范围.从判别过饱和路段出发,以交叉口之间的关联度为量化指标,建立并验证关联度计算模型,并通过界定阻塞区、过渡区和常态区以及消散区提出过饱和状态下交通控制小区的动态划分方法.结合实例标定划分小区的关联度关键值,给出控制结构范围确定的具体流程.过饱和状态交通控制小区的划分为城市道路网过饱和交通信号控制策略的研究提供参考.

Method of Delimiting Urban Traffic Signal Coordinate Control Subarea Under Oversaturated Condition

To find an effective method to control an oversaturated network,it is essential for the traffic control system to make a quick response to the oversaturated circumstance.Accordingly,the traffic signal control subarea related to the oversaturated link should be delimited at the very beginning.The oversaturated link was identified at first,and then the connection model was presented and verified on the basis of quantizing the connection index between intersections.A dynamic method was proposed to delimit the coordinate control subarea under oversaturated condition by defining the congested area,interim area,normal-state area and dissipated area.The threshold values of connection index for subarea delimitation were calibrated and the detailed steps of delimitation were also explained via a case study.The research of delimiting signal coordinate subarea under oversaturated state lays the foundation for the research of traffic control strategies for an oversaturated urban traffic signalized network.