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Title: Queue clearance rate method for estimating passenger car equivalents at signalized intersections
Authors: Mohan M.
Chandra, Satish
Published in: Journal of Traffic and Transportation Engineering (English Edition)
Abstract: This study explored the use of queue clearance rate method for estimating passenger car equivalent (PCE) at signalized intersections. PCE was estimated based on the assumption that the rate at which a queue of vehicles clears the intersection is a function of its composition. Results of this method were compared with the results estimated by some popular techniques. A four-legged intersection was simulated in VISSIM software and different techniques were used to convert the traffic mix into a uniform one. Parameters of VISSIM were modified to closely reflect the traffic behaviour under heterogeneous traffic conditions. All approaches of the intersection were loaded to saturated conditions and accuracy of estimated PCEs were established by comparing converted flow (PCE/h) with the capacity of an all-car traffic stream. Method based on saturation flow delivered the best result, but its use was limited to traffic composed only of two types of vehicles. Results of regression and optimization techniques were almost similar and the converted flow was close to the capacity of all-car stream. However, accuracy of these methods strongly relied on the correct measurement of saturation flow. Queue clearance rate method did not require value of saturation flow and yielded good estimates of PCE throughout the simulation runs. The maximum difference between the converted flow and capacity estimated with all car situations was found to be less than 10% in all cases considered in this study. ¬© 2017 The Authors
Citation: Journal of Traffic and Transportation Engineering (English Edition), 4(5): 487-495
Issue Date: 2017
Publisher: Periodical Offices of Chang- an University
Keywords: Passenger car equivalents
Queue clearance rate method
Signalized intersection
ISSN: 20957564
Author Scopus IDs: 56597539200
Author Affiliations: Mohan, M., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Chandra, S., Central Road Research Institute, New Delhi, 110025, India
Funding Details: 
Corresponding Author: Mohan, M.; Department of Civil Engineering, India; email:
Appears in Collections:Journal Publications [CE]

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