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Study and Evaluation of Sub Area Linkage Algorithm in COSMOS  

Lee, Young-Ihn (서울대학교 환경대학원 교통관리)
Kim, Sang-Yoon (한국도로공사 도로교통기술원)
Publication Information
Journal of Korean Society of Transportation / v.22, no.2, 2004 , pp. 109-119 More about this Journal
Abstract
In COSMOS, an area for signal coordination is divided into subareas composed of several signalized intersections that share a common cycle time. Each subarea contains only one critical intersection having heavy traffic load. Subarea is a basic unit of control. The performance of COSMOS is highly dependent on the linkage rule between adjacent subareas. The purpose of this study is to provide an appropriate subarea linkage rule in COSMOS. This study developed a control strategy for Critical Intersection and Sub Area linkage. Critical Intersections calculate the Offset Pattern both East-West Axis and North-South Axis, and the coordination direction either East-West Axis or North-South Axis. Subarea can be combined with other one in all directions. The performance of the suggested linkage rule was evaluated on the real network in Gangnam-Gu. The result was that travel time was reduced by the suggested linkage rule.
Keywords
COSMOS; Sub Area; CI;
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