The Universal Traffic Management Society of Japan (UTMS) and the Tokyo Metropolitan Police Department have been working together to put the interactive Centrally Determined Route Guidance (CDRG) system to practical use. This system is designed to identify recommended routes based on the link travel time data provided by the traffic control system. Thus, the system is capable of offering guidance on the optimum recommended route taking the shortest possible time, even in the early stage immediately after its practical implementation when the system cannot obtain sufficient amounts of travel time data measured by in-vehicle units. A prototype system was constructed in the central part of Tokyo in 1996 to implement field trials, and satisfactory results were obtained in the previous three field trials. The third step field trial was carried out in March 1998 as the final evaluation of system performance and produced results indicating that the system provides sufficient route guidance capabilities on road networks including expressways for practical application in an actual traffic system. In February 1999, the fourth step field trial was carried out to evaluate route guidance to remote destinations and the provision of information regarding recommended lanes and intersections at fork roads with a view to further enhancing the system's capabilities. (A*)
Samenvatting