PHOTO-INTERPRETATION OF SKID RESISTANCE

STEREOPHOTOGRAPHS ARE USED FOR DESCRIBING PAVEMENT SURFACE TEXTURES IN TERMS OF SEVEN TEXTURE PARAMETERS. A PAVEMENT SURFACE IS IDENTIFIED BY A TEXTURE CODE NUMBER CONSISTING OF SEVEN DIGITS, ONE FOR EACH TEXTURE PARAMETER. SEVERAL THOUSAND PAVEMENTS WERE TESTED WITH AN ASTM SKID TRAILER AND STEREOPHOTOGRAPHED. THE PAVEMENT TEXTURES WERE ANALYZED AND THE RESULTING TEXTURE CODE NUMBERS WERE CORRELATED WITH THE SKID NUMBERS OF THE WET PAVEMENTS. THE CORRELATION STUDY INDICATES THAT THE SKID NUMBERS OF ALL PAVEMENTS WITH THE SAME TEXTURE CODE NUMBER ARE PRACTICALLY THE SAME AS THE SKID NUMBERS OBTAINED BY REPEATED TESTS RUN OVER ONE PAVEMENT SECTION. THE SKID NUMBER OF A PAVEMENT SURFACE CAN BE ESTIMATED BY ASSIGNING "FRICTION WEIGHTS" TO EACH TEXTURE PARAMETER. AN ACCEPTABLE DEGREE OF CORRELATION BETWEEN INTERPRETED AND MEASURED SKID RESISTANCE WAS OBTAINED. THE METHOD DESCRIBED HAS SEVERAL USEFUL POTENTIALITIES, IN THAT IT OFFERS AN INSIGHT INTO THE PAVEMENT TEXTURE-SKID RESISTANCE RELATIONSHIP AND MAKES PAVEMENT-TEXTURE DESIGN A PRACTICAL POSSIBILITY; IT CAN BE USED FOR SKID-RESISTANCE DETERMINATION IN LOCATIONS WHERE SKID TRAILERS CANNOT BE USED (CURVES AND INTERSECTIONS); IT CAN GIVE LESS AFFLUENT MUNICIPAL AUTHORITIES A MEANS OF ESTIMATING THE SKID NUMBERS OF THEIR PAVEMENTS; AND IT RAISES SKID-RESISTANCE MEASUREMENTS FROM THEIR PRESENT UNREALISTIC ISOLATION AND LINKS THEM WITH THEIR PAVEMENT TEXTURE (THIS MAY HELP TO DEAL WITH THE PROBLEM POSED BY THE APPARENT INCONSISTENCY OF SKID MEASUREMENTS OF THE SAME PAVEMENT OBTAINED BY DIFFERENT SKID TRAILERS, AND ALSO WITH THE PROBLEM OF CORRELATING SKID-RESISTANCE MEASUREMENTS, OBTAINED AT DIFFERENT TIMES, IN DIFFERENT GEOGRAPHIC LOCATIONS). BECAUSE THE METHOD DOES NOT DISCARD A SKID-TEST RESULT AFTER IT HAS BEEN USED FOR AN INDIVIDUAL PAVEMENT, BUT CONTINUES TO USE IT TOGETHER WITH PREVIOUS AND SUBSEQUENT TEST RESULTS FOR PAVEMENTS OF THE SAME SURFACE TEXTURE, IT CAN BE EXPECTED THAT ITS USEFULNESS WILL INCREASE AS TEST DATA ACCUMULATE. THE METHOD DESCRIBED IN THIS REPORT IS AN INITIAL ATTEMPT AT DEVISING A TECHNIQUE FOR PAVEMENT TEXTURE ANALYSIS THAT CAN BE USED FOR PHOTO-INTERPRETING SKID RESISTANCE AND IT IS HOPED THAT IT WILL LEND ITSELF TO FURTHER DEVELOPMENT AND IMPROVEMENT BY OTHER WORKERS. /AUTHOR/

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  • Supplemental Notes:
    • Paper sponsored by Committee on Surface Properties--Vehicle Interaction and presented at the 49th Annual Meeting. 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.
  • Authors:
    • Schonfeld, R
  • Publication Date: 1970

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: pp 11-25
  • Monograph Title: Pavement slipperiness, roughness, and condition evaluation
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00207188
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 28 1970 12:00AM