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.