Accuracy of the HCM 2000 Queue Clearance Model: Case of Multiple Approach Lanes with Shared Left Turns and Multiple Opposing Lanes
Publication: Journal of Transportation Engineering
Volume 131, Issue 12
Abstract
Appendix C of Chap. 16 in the Highway Capacity Manual 2000 (HCM 2000) discusses the method for calculating the left turn factor for permitted left turns. This method uses the queue clearance model, represented by equation C16-6 of the HCM 2000 to calculate the left-turn factor. This paper reports on a study of the accuracy of this queue clearance model to predict observed clearance times. For this study, queue clearance times were observed for multiple-lane approaches with shared left turns and opposing multiple-lane approaches for five study intersections located throughout Missouri. Data collected at each intersection were used as inputs to the HCM 2000 queue clearance model to predict queue clearance times. A comparison of the predicted queue clearance time and the observed queue clearance time found that the HCM 2000 queue clearance model underestimates observed clearance times on average by . Further research is needed to identify the source of this bias and to recommend improvements to the HCM 2000 model.
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References
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Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 131 • Issue 12 • December 2005
Pages: 912 - 916
Copyright
© 2005 ASCE.
History
Received: Mar 25, 2004
Accepted: Mar 11, 2005
Published online: Dec 1, 2005
Published in print: Dec 2005
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