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http://dx.doi.org/10.7470/jkst.2012.30.1.075

The Analysis of the Impact of Heavy Vehicles in Urban Freeway Basic Section  

Kim, Tae-Heon (Department of Urban Planning & Engineering, Yonsei University)
Roh, Chang-Gyun (Department of Urban Planning & Engineering, Yonsei University)
Son, Bong-Soo (Department of Urban Planning & Engineering, Yonsei University)
Publication Information
Journal of Korean Society of Transportation / v.30, no.1, 2012 , pp. 75-83 More about this Journal
Abstract
This study is to find a shortcoming embedded in the current Korean Highway Capacity Manual (KHCM) on reflecting a heavy vehicle effect to the highway capacity. The KHCM suggests to handle the percent heavy vehicle to deal with its effect to a capacity regardless of density levels. Authors hypothesized in this study that the effect of heavy vehicles would vary at different levels of traffic density - the effect would be comparably insignificant when a density is low and it becomes comparably significant when it becomes high. Field data from a freeways located in Seoul were collected for 360 hours (15 days) and categorized them into a set of operation conditions grouped by 15 minutes and by the LOS density levels. Comparison between the field measured and the estimated by the KHCM method showed that the KHCM method overestimated the effect of heavy vehicles in LOS B and C but underestimated in LOS E. The results suggested that there be a difference pattern from the one the KHCM expected and brought discussion on further studies.
Keywords
Level of service; Heavy vehicle; Traffic flow; Density; Occupancy;
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