The AMIS (Advanced Mobile Information Systems) which premises the VICS (Vehicle Information and Communication System) which provides drivers with traffic information in real time has been developed. This system has been in use since March 2000 in Hakodate, Hokkaido Prefecture. Service areas and the accuracy of provided information are important for success. However, it is difficult to retain the stability of information accuracy in this district where traffic conditions change considerably with the seasons. Therefore, new methods were developed aiming at accuracy and stability of information as well as extension of service areas by using data from vehicle detectors on road as efficiently as possible. Their evaluation on the target road gave good results. In particular, the on-line parameter tuning method for travel time estimation was very effective and it should be able to deal with changes of traffic conditions in the future.
Samenvatting