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http://dx.doi.org/10.12815/kits.2016.15.6.102

A Study of Ramp Metering System Using Off-ramp Exit Percentage  

Kang, Woojin (University of Seoul)
Kim, Youngchan (University of Seoul)
Lee, Minhyoung (University of Seoul)
Publication Information
The Journal of The Korea Institute of Intelligent Transport Systems / v.15, no.6, 2016 , pp. 102-115 More about this Journal
Abstract
In this study, a scheme of ramp metering that uses Off-ramp Exit Percentage instead of the O/D table required for systems of integrated control of ramps at the target freeway segment is presented. The segment from Gyeyang IC to Jangsu IC on the Seoul Outer Ring Expressway was selected for the study because the segment frequently shows large volume of traffic on the short distance between the two ICs requiring an integrated on-ramp control by taking the traffic situation on an entire expressway into account despite an unavailability of O/D data. Thus the information of Off-ramp Exit Percentage at each IC were collected instead of securing the O/D table through actual survey, and the congestion on the segment was analyzed to identify the validity of the use of off-ramp traffic instead of O/D data. In addition, the scheme of ramp metering that exploits the off-ramp traffic information was prepared through simulations conducted in a way supporting the traffic control for respective access roads thereof by taking traffic situations and queues on each ramp into account. The results obtained from the simulation analyses revealed an improved level of travel speed and traffic volume on the main line and validated the use of off-ramp traffic instead of the O/D table for the ramp metering.
Keywords
Freeway Traffic Management; Ramp Metering; O/D table; Off-ramp Exit Percentage;
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