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http://dx.doi.org/10.7470/jkst.2015.33.4.337

An Estimation of the Minimum Distance Between a Roundabout and Signal Crosswalk Using VISSIM  

KIM, Young Beom (Dept. of Transportation Eng., University of Seoul)
LEE, Dongmin (Dept. of Transportation Eng., University of Seoul)
Jun, Jin Woo (Dept. of Transportation Eng., University of Seoul)
Cho, Hanseon (Dept. of Highway Transport, Korea Institute of Construction Technology)
Publication Information
Journal of Korean Society of Transportation / v.33, no.4, 2015 , pp. 337-347 More about this Journal
Abstract
Since the application of roundabouts by 2010 have been started, more than 350 roundabouts were installed in Korea. Recently the types of constructed roundabouts become various, and the intersection conditions for installing roundabouts were also various. However, there were some difficulties to install roundabouts around school zone due to safety problems. In this study, appropriate distance from adjacent signal crosswalks to roundabouts were estimated for securing pedestrian safety and operation efficiency around school zone. With the analyses, the minimum distance standard was suggested to obtain operational effectiveness of roundabout according to traffic volume, traffic flow, pedestrian green time and secures pedestrian safety and convenience. In this paper, average delay of roundabout as various length of distances between an adjacent crosswalk and a roundabout as different pedestrian signal times, traffic volumes, traffic flow rates were analyzed. Through this study, it was found that about four times of delay in a roundabout was generated if there was adjacent signal crosswalk. However if there is enough distance between an adjacent crosswalk and a roundabout, the value of increasing delay on roundabouts with adjacent a signalized crosswalk can be considerably reduced. Critical value of the distance between a roundabout and a signal crosswalk in case of roundabouts within 200-500 vehicle/hour/lane entry traffic flow, 20-40% of left turn traffic, and over 15 seconds pedestrian green time was about 50 meters. In conclusion, if there is minimum 40 meter distance from roundabouts, adjacent signal crosswalks can be installed and operated for students' safety around school zone.
Keywords
delay; minimum distance; roundabout; school zone; signalized crosswalk; VISSIM;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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