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http://dx.doi.org/10.12652/Ksce.2018.38.2.0269

Modified Approaches to Delay Estimation for the Work Zones in the Proximity of the Signalized Intersections  

Shin, Chi-Hyun (Kyonggi University)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.38, no.2, 2018 , pp. 269-281 More about this Journal
Abstract
Unlike its archetype predecessor such as the Highway Capacity Manual of the United States, the Korean Highway Capacity Manual of 2013 provides the analytical models for estimating the saturation flow rates for the lane-occupying work-zones in the proximity of the signalized intersections. Direct application of the revised saturation flow rates into the classic control delay models, however, appears to produce unreasonable delay amount as traffic demand approaches lane-group capacities and surpasses them, which is common phenomena in the work-zones. Complex interaction among vehicles, lane-dropping work-zone geometry and signal operations were never accounted in the traditional control delay models, and considerable differences between the delay model outcomes and field observations are repeatedly experienced. This paper proposes the modified approaches to the delay models in the manual, exerted on all three elements of control delay, and particularly focuses on the temporal and spatial boundary expansion in comparing the simulated results to the estimated ones. Extensive microscopic simulation work and calibration effort supports the modified approaches well enough to use them in the work-zone planning and evaluation.
Keywords
Control delay; Highway capacity manual; Microscopic simulation; Signalized intersection; Work zones;
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Times Cited By KSCI : 1  (Citation Analysis)
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