Since the opening of Gyeongbu Expressway, the first Korean expressway of 428km connecting Seoul and Busan in 1970, the total length of expressway exceeds 4,200km at the moment. The Expressway Traffic Management System (ETMS) started at the Seoul-Daejeon section of Gyeongbu Expressway in 1992 and it was expanded to the whole expressway network. Although the introduction of a successful traffic management system, the total recurrent congested sections below 40kph are 51 sections of 373km on expressways and the traffic congestion cost as a social cost reaches a total of 2.8 trillion KRW (about US $2.6 billion) only on the expressways. Measures to improve traffic congestion can be applied to expanding the supply of facilities and increasing the efficiency of facilities. Physical improvement, which means expansion and construction of roads, is cost and time constrained, and there is also a limit for the improvement of traffic operation. In order to maximize the effect of traffic congestion management, there is a need to harmonize the both, but there is still a lack of awareness of the importance of integrated traffic management in Korea. In this study, the concept of Integrated Traffic Management (ITM) on expressways integrating various individual traffic management techniques such as ramp metering, toll metering, and variable speed limit is proposed and the effect of the effect of Integrated Traffic Management was carried out by the microsimulation model for 15km section on the Seoul Outer Ring Expressway.

• Seungjun, Lee(Research Institute, Korea Expressway Corporation)