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A Study on Operation Technique and Effective Analysis of Expressway Variable Speed Limits Control  

Im, Gwan-Su (한성대학교 정보시스템공학과)
Nam, Du-Hui (한성대학교 정보시스템공학과)
Publication Information
Journal of Korean Society of Transportation / v.29, no.2, 2011 , pp. 7-14 More about this Journal
Abstract
This paper discusses operational technique and effectiveness of Variable Speed Limits system that is implemented to control the traffic-flow on the Naebu Expressway. As the first step of the analysis, traffic data collected from vehicle detectors are corrected and smoothed. Applying a pattern analysis technique to the traffic data, the weekday traffic is classified into four different groups, and median of each group is calculated. Using three state variables, i.e., diverted traffic volume, average density and average speed, the conditions of roadway segments are determined. Computational outputs resulted from the application of the proposed model to the scenarios show that implementation of Variable Speed Limits system improved both safety and efficiency of the expressway. For the operational strategy, this paper also presents the change rate of the speed limit, and the effective duration of the speed limit according to the entering traffic volume.
Keywords
Expressway; Pattern analysis; Data-mining; Traffic Flow Control; VSLc;
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