Research Article
Mar 1981
Downgrade Speed Characteristics of Heavy Vehicles
Authors: Abishai Polus, M.ASCE, Joseph Craus, and Izhak GrinbergAuthor Affiliations
Publication: Transportation Engineering Journal of ASCE
Volume 107, Issue 2
Abstract
The speed characteristics of heavy vehicles on downgrades are analysed. The analyses were made by field observations of truck speeds on six rural two-lane downgrades. Loaded trucks considerably reduced their speeds at the beginning of a downgrade. The amount of reduction, termed the approach-speed gradient, was related to the length and slope of the downgrade, the second variable contributing exponentially to the increase in gradient. Buses and empty trucks increased their speeds at the downgrades studied. Using a previously developed model, which is based on delay measures and the speed distribution of trucks and passenger cars, passenger-car equivalents for downgrades are calculated and evaluated.
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Published In
Transportation Engineering Journal of ASCE
Volume 107 • Issue 2 • March 1981
Pages: 143 - 152
Copyright
© 1981 American Society of Civil Engineers.
History
Published in print: Mar 1981
Published online: Feb 5, 2021
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Authors
Affiliations
Abishai Polus, M.ASCE
Sr. Lect. of Civ. Engrg., Dept. of Civ. Engrg., Technion–Israel Inst. of Tech., Haifa, Israel; currently Visiting Assoc. Prof., Dept. of Civ. Engrg., West Virginia Univ., Morgantown, W. Va. 26506.
Joseph Craus
Prof. of Civ. Engrg. and Head of Transportation Research Inst., Technion–Israel Inst. of Tech., Haifa, Israel
Izhak Grinberg
Research Engr., Dept. of Civ. Engrg., Technion–Israel Inst. of Tech., Haifa, Israel
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.