城市路网交通控制子区动态划分策略

Strategy of Dynamic Traffic Control Subarea Partition in Urban Road Network

为提高交通控制系统自适应水平,阐述了交通控制子区划分的研究现状,从系统性、科学性、快速性3个方面对现有成果进行了剖析;从交通控制系统整体角度出发,研究了子区划分与信号配时方案优化的内在联系,明确了二者所面向的道路环境、交通流环境、信息检测环境;以饱和度为指标将交叉口状态划分为低饱和、中饱和、准饱和、过饱和4个等级,并确定了每个状态等级交叉口的控制目标;根据子区划分与信号配时优化目标一致性的原则,建立了子区划分目标集,确定了各个目标的优先级别;建立了交通控制子区划分原则,提出了关联度模型与划分算法的建立思路;最后从策略层、理论层、算法层3个层面形成了交通控制子区动态划分框架体系。研究成果可以为关联度模型以及子区划分算法的建立提供指导。

To improve the adaptive level of traffic control system, current research status on subarea partition was firstly introduced. Then it was analyzed from the aspects of systematicness, scientificalness and rapidity. Based on the entire traffic signal control system, the internal relation between subarea partition and signal timing algorithm was studied and then the environment of road network, traffic flow and information detection, which they both faced, were determined. The intersection state was divided into four levels according to the saturation degree index, low saturation, middle saturation, quasi-saturation and supersaturation. The optimization objective of each level was determined. According to the consistency of the optimization objective of subarea partition and signal timing, the objective set of subarea partition was brought forward and the priority sequence of the objectives was determined. Moreover, the partition principles and the development ways of correlation degree model and partition algorithm were presented. At last, the framework of dynamic subarea partition was established from three levels, which were strategy, methodology and algorithm. The study in this paper can provide guidance for further development of correlation degree model and subarea partition algorithm.