INSTABILITY ANALYSIS OF A VEHICLE NEGOTIATING A CURVE WITH DOWNGRADE SUPERELEVATION
THIS STUDY WAS INITIATED AS A RESULT OF NUMEROUS SKIDDING ACCIDENTS OCCURRING AT LOCATIONS WHERE HIGHWAY GEOMETRICS INCLUDE A COMBINATION OF DOWNGRADE, CURVE, AND SUPERELEVATION. MATHEMATICAL EQUATIONS ARE DEVELOPED FOR OBTAINING ALL THE WHEEL FORCES (BOTH NORMAL AND LATERAL) OF A VEHICLE NEGOTIATING SUCH A CURVE AT THE INSTANT OF INCIPIENT SKIDDING FOR A VARIETY OF PARAMETERS. FACTORS THAT APPEAR TO BE MOST IMPORTANT IN REGARD TO CRITICAL SKIDDING VELOCITIES ARE THE LATERAL COEFFICIENT OF FRICTION BETWEEN THE TIRE AND THE ROAD SURFACE AND DRIVER MANEUVERING. FACTORS THAT APPEAR TO HAVE LITTLE INFLUENCE ARE SUPERELEVATION (IF RELATIVELY SMALL), CROSSWIND VELOCITY, AND TYPE OF VEHICLE (EXCLUDING TRACTOR-TRAILERS). /AUTHOR/
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Supplemental Notes:
- Sponsored by Committee on Geometric Highway Design and Committee on Surface Properties Vehicle Interaction. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
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Authors:
- Zuk, William
- Publication Date: 1972
Media Info
- Media Type: Print
- Features: References; Tables;
- Pagination: p. 40-44
- Monograph Title: Geometric design implications and vehicle noise
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Serial:
- Highway Research Record
- Issue Number: 390
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Curves (Geometry); Highway design; Road downgrades; Skidding; Superelevation; Vehicle performance
- Uncontrolled Terms: Horizontal curvature; Lateral loads
- Old TRIS Terms: Downgrade
- Subject Areas: Highways; Safety and Human Factors;
Filing Info
- Accession Number: 00223882
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Sep 19 1972 12:00AM