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http://dx.doi.org/10.7470/jkst.2013.31.3.045

An Expressway Path Travel Time Estimation Using Hi-pass DSRC Off-Line Travel Data  

Shim, Sangwoo (Transportation Research Institute, Ajou University)
Choi, Keechoo (Department of Transportation Systems Engineering, Ajou University)
Lee, Sangsoo (Department of Transportation Systems Engineering, Ajou University)
NamKoong, Seong J. (Expressway and Transportation Research Institute, Korea Expressway Corporation)
Publication Information
Journal of Korean Society of Transportation / v.31, no.3, 2013 , pp. 45-54 More about this Journal
Abstract
Korea Expressway Corporation has been utilizing vehicles equipped with dedicated short range communication (DSRC) based on-board equipment (OBE) for collecting path travel times. A path based method (PBM) estimates the path travel time using probe vehicles traveling whole links on the path, so it is not always possible to obtain sufficient samples for calculating path travel time in the DSRC system. Having this problem in utilizing DSRC for travel time information, this study attempted to estimate path travel time with the help of a link based method (LBM) and examined whether the LBM can be used for obtaining reliable path travel times. Some comparisons were made and identified that the MAPE difference between the LBM and the PBM estimates are less than 3%, signaling that LBM can be used as a proxy for PBM in case of sparse sample conditions. Some limitations and a future research agenda have also been proposed.
Keywords
DSRC; LBM; Path Travel Time; PBM; Probe Link Travel Time;
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Times Cited By KSCI : 8  (Citation Analysis)
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