Shanghai Traffic Information Management and Evaluation System

With the increasing interest in Intelligent Transportation Systems (ITS), the construction of traffic data collection systems in many cities has expanded in recent years. All these data have built a good basis for the urban traffic managers to better understand the real traffic conditions and future developing trends. Trying to use these data well in this way, Shanghai Traffic Information Management and Evaluation System (SHTIMES) has been developed in Shanghai, China. The objective of SHTIMES is to integrate all the collected data from different sources and give a reasonable traffic operation evaluation so that the corresponding traffic managers can make their decision based on that. Three key aspects during SHTIMES development are addressed in this paper: Firstly, in the data collection aspect, the "closing ring" scheme is adopted for the surface road network, which can infer all the traffic flow over the network; secondly, in the model part, a united evaluation model for all the urban roads is introduced; finally, a C/S structure is used in the system design. All the functions related to calculation and are assigned to the server end and all the functions related to the information management and analyses are assigned to the client end.