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Development of an Urban Freeway Exit-Intersection Control Strategy using Actuated Traffic Control  

So, Jae-Hyun (한국교통연구원 첨단교통연구실)
Cho, Han-Seon (한국교통연구원 도로교통연구실)
Lee, Seung-Hwan (아주대학교 환경건설교통공학부)
Publication Information
Journal of Korean Society of Transportation / v.26, no.6, 2008 , pp. 81-89 More about this Journal
Abstract
This paper aims to develop an integrated urban freeway exit-intersection actuated traffic signal control strategy based on which a real-time detection of queue at each of an exit-ramp and an arterial. To evaluate effects of the proposed actuated traffic signal control according to various traffic situations and geometric conditions, this paper analyzed the effects of the proposed traffic signal control strategy according to traffic situations such as the occasion of the arterial being saturated, the occasion of the exit-ramp being saturated, and the occasion of both the arterial and the exit-ramp being saturated. To reflect geometric conditions that influence the effects of the control strategy, this paper evaluated effects before and after applying the actuated traffic signal control strategy according to six cases for both above and under the downstream link length of 200m as proposed by COSMOS. The study results shown that when the link length above 200m, offered a greater effect of applying the actuated traffic control strategy than below 200m. Thus, the actuated traffic signal control through a real-time detection of queue is expected to offer a greater effect at longer downward link.
Keywords
Urban freeway; Exit ramp; Actuated traffic control; Queue detection; Over-saturated;
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