The road network along with the traffic surveillance and control devices are represented in detail. The road network consists of nodes, links, segments, and lanes. The surveillance system consists of various detectors that collect traffic data, which can be either recorded in files and/or sent to the traffic management simulator. Traffic signal devices at intersections, speed limit signs, message signs, lane use signs, toll booths and special facilities (e.g. tunnels) are also represented. Their states are dynamically updated by the traffic management simulator.