GPS/GIS Based Electronic Road Pricing System DesignXu Aigong School of Geomatics, Liaoning Technical University, China, 123000 eagxu@ntu.edu.sg ABSTRACT: This paper presents a new charging scheme based on distance vehicle traveled in different areas determined by GPS positioning and digital road network database in GIS. The system architecture is designed and system modules are presented. The new system not only more consistent with road pricing principles and objectives of reducing traffic congestion and air pollution, but also more flexible for the integration of ERP system with other Intelligent Transportation Systems (ITS). The capital investment and operating costs are less than traditional ones and is relatively simple to implement and modifying. 1 Background Road pricing has been effective in managing congestion on roads in the metropolis of Asia and all over the world. Changes have been made to the road-pricing scheme since its implement from a manual scheme based on paper permits to an electronic version. Technologies like Global Positioning System (GPS) and Geographical Information System (GIS) make the expansion and more effective of the road pricing scheme possible. This paper presents a new charging scheme for the next phase of Electronic Road Pricing (ERP) system based on GPS and GIS. The system architecture is designed and some basic modules are discussed. The new scheme charging will be based on distance vehicle traveled in different areas determined by GPS positioning and digital road network database in GIS. This makes the new system not only more consistent with road pricing principles and objectives of reducing traffic congestion and air pollution, but also more flexible for the integration of ERP system with other Intelligent Transportation Systems (ITS) such as emergency assistant and dynamic traffic assignment. At the same time, it has lower capital investment and operating costs, and is relatively simple to implement and modifying. 2 System Design The new designed system consists of the management center, the in-vehicle unit, and the communication link, and some program modules. 2.1 The management center The proposed management center of next ERP system is functioned to tracking, monitoring, charging and guiding all the vehicles traveling on the road. Charging and guiding scheme is on the basis of collected traffic information and map database. Figure 1 shows the architecture of management center. Communication server is used to exchange information through Internet, which is the interface between the in-vehicle unit transceiver and the management center. It is not only used for vehicular position to be sent to the management center from the vehicle side, but also for the road map to be transmitted to the vehicle when it requires to display but has no map itself. The guidance command and charging scheme are also transmitted to the vehicle from the communication server. Traffic information analysis provides the statistics of traffic flow on the road on the basis of the real time vehicle position, makes charging scheme for each road and guiding scheme for the vehicle. Tracking and Monitoring provides an interface for the operator in the management center.  Fig. 1 The diagram of the next ERP system management Center
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