Field and simulation tests of the interactive CDRG in UTMS

Tokyo Metropolitan Police Department is planning to realize a universal traffic management system (UTMS) using 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. We constructed the trial system for CDRG on major roads in central Tokyo, and successfully conducted the second-step field test in February of 1997, following the first-step test in autumn of 1996. In the second-step test, we 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 our route guidance. We also computer simulated our 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.