Samenvatting
The Hanshin Expressway Public Corporation (HEPC) has examined techniques for improving accuracy in the estimation of travel-time information. This information is based on vehicle speed data collected from the conventional vehicle detectors. In this paper, a technique is discussed for correcting estimated travel-time information by using Automatic Vehicle Identification (AVI) units in real time to improve accuracy in travel-time estimation for an unsteady traffic flow such as at the time of congestion.