区域高速公路网络交通事件传感器布设方法研究

针对如何使用有限的传感器而获得最大的事件检测效益的问题,依据区域高速公路网络拓扑特点,充分利用匝道以及出入口的重要特性,以常规的最短路径算法为基础研究了一种交通事件传感器的优化布设方法,以高速公路网络行程时间标准差作为优化目标,在充分利用现有资源前提下,分别布设和优化路段和出入口事件检测器,形成两层结构的事件检测传感器网络体系。并以上海市高速公路网为例进行了实例应用分析。结果表明,依据合适的优化方法可以确定传感器最佳布设位置和数量,同时结合高效的交通事件检测算法,可以全面提升交通事件检测技术。

Study on Deployment of Traffic Incident Detectors for Regional Expressway Network

The problem that how to get maximum effect of traffic incident detection with limited detectors was discussed. The characters of regional expressway network topology, ramps and exit/entries were considered. The commonly used shortest path algorithm was applied to optimize detectors deployment. The standard deviation of travel time was selected to be optimization objective. In full use of existing resources, deployment and optimization for link  and exit/entry traffic incident detectors were studied respectively, and a double-layer structure of event detection sensor networks was created. The application of this method to the expressway network of Shanghai shows that (1) appropriate optimized theory can be used to determine the optimal position and quantity of detectors; (2) transportation event detection technology can be advanced with efficient detecting algorithm.