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

COSMOS, a real-time signal control system developed in the 1990s, is an active way to resolve traffic congestion and supports easing intersection communication in response to real-time traffic demand. However, due to safety and efficiency problems, most signalized intersections in Korea operate as pattern-based fixed signal control based on TOD. In a situation where various traffic pattern changes are occurring in real-time, the need for designing real-time signal control strategies applicable to domestic infrastructure is increasing. Accordingly, in the research project on the development of a smart signal operation system, a real-time signal control CAERUS that supports the degree of saturation equalization of each vehicle movement using travel time history data developed. CAERUS supports cycle length increase, decrease and green time adjustment based on the predicted demand volume. Recently, with the development of high-quality image detection technology, calculating the degree of saturation of each vehicle movement in real time without separate historical data. Therefore, this study advanced CAERUS based on the traffic demand collected using the latest image detection technology. To evaluate the efficiency of advanced CAERUS, a simulation environment was established for the Dogok-Daechi section of Gangnam-gu, Seoul, where an image detector was installed. As a result of the analysis, CAERUS effectively improved the intersection communication situation while supporting the equalization of delays in each vehicle movement according to the changing demand volume compared to TOD. CAERUS designed in this study is expected to have a greater delay improvement effect when operating at intersections with a large degree of saturation differences for each vehicle movement. In addition, it is expected that more flexible signal control will be possible when expanding strategies considering right-turn movement in the future.