Universal Traffic Management System (UTMS) and Tokyo Metropolitan Police Department are planning to realize the interactive Centrally Determined Route Guidance (CDRG). 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 quantities of travel time data measured by in-vehicle units, the system can still provide guidance relating to the shortest route in terms of time required. The authors constructed the trial system for CDRG on major roads in central Tokyo and successfully conducted the second-step field test in February 1997, following the first-step test in Autumn 1996. In the second-step test, they evaluated the performance of the system with vehicles guided under different kinds of formulae running in the trial area, which resulted in proving the superiority of their route guidance. They also computer simulated their route guidance method to comprehensively verify its performance, which is difficult to investigate in the field test. This paper reports on the second-step field and simulation tests.
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