The interactive CDRG using infrared beacons

Universal Traffic Management Society of Japan and Tokyo Metropolitan Police Department are planning to implement the interactive centrally determined route guidance (CDRG) system. The system selects the recommended route using link travel time data, which is gathered by the traffic control system. Therefore, even in the early stages of its adoption when it cannot obtain large amounts of travel time data measured by in-vehicle units, the system can still provide guidance relating to the shortest route in terms of the time required. We constructed the CDRG trial system for use on major roads in central Tokyo in 1996, and since then have successfully conducted a series of four field tests, which proved the superiority of our route guidance system.