Journal of Korean Society of Transportation ISSN:1229-1366(Print) 2234-4217(Online) 대한교통학회지

Metropolis such as Seoul are experiencing oversaturation at the signal intersection several times a day. Without suitable measures, the queues increase to such an extent that they can not control, leading to blockage at the intersection reaching the upstream intersection. If there is no appropriate action for oversaturation, the queue becomes uncontrollable and block the upstream intersection. If blockage at intersection occur, it is difficult to cross the intersection in green time, so that the oversaturated situation is spreaded again to the upstream intersection, which causes congestion to the entire network. In this study, to overcome the limitation of the control strategy at oversaturated situation in the COSMOS, we develop the network-wide signal control strategy for preventing blockage at intersection using the front detection system of the COSMOS system. The network-wide signal control strategy for preventing blockage at intersection is a strategy that can immediately respond to the occurrence of the blockage at the intersection and can adjust phase considering the upstream and downstream network traffic conditions. In addition, the control strategy is simplified so that it can be applied to the actual field, and a signal control strategy which is ordered by stages is proposed. Simulation results using the VISSIM Com-interface show that The network-wide signal control strategy for preventing blockage at intersection reduces the average control delay per vehicle by about 30 seconds and the stopping frequency per vehicle by about 2.5 times compared with the conventional TOD signal operation.