ESTIMATION OF PATH FLOWS AND MODIFICATION OF O-D FLOWS BASED ON PROBE VEHICLE INFORMATION AND TRAFFIC COUNTS

Abstract

A model for estimating path flows and modifying O-D flows simultaneously is proposed, in which probe vehicle information and traffic counts are used. The probe vehicle information is accumulated to obtain prior information on path proportions. The link traffic counts are used as sectional volume information of links. The proposed model is constructed as a two stage model. The first stage model is estimation model of path flows and the second stage model is modification model of O-D flows. The proposed model was applied to the Sioux Falls network. As a result, the accuracy of estimated path flows changed in proportion with a ratio of probe vehicles. Moreover, it was clarified that the proposed two stage model had enough ability to estimate path flows and to modify O-D flows accurately even when prior O-D flows had inconsistency with the current traffic conditions.