Researcher of Korea Highway Corporation

The objective of this study is to obtain more accurate Origin-Destination (O-D) matrices with exact data such as Toll Collection System (TCS) O-D matrices, counted link volumes and express bus O-D matrices by EMME/2. First, an effect region of each tollgate was set up. In and out volumes of each tollgate were distributed to zones in the effect region of it. The distributed O-D was assigned to the network composed of all tollgates and their effect zones. Next, we adjusted the regional O-D matrices excluding TCS O-D matrices in order to reflect the observed volumes considering the express bus and the assigned link volumes as additional ones. The assigned volumes with the estimated traffic-zonal O-D matrices produced the only 17.9 % error all over the freeways when they were compared to the real traffic volumes and the difference between assigned link volumes and counted ones is reduced very much all over the counted links