MEASURING ROAD SURFACE SLIPPERINESS

COMPARATIVE TESTS WITH TRAILERS, STOPPING-DISTANCE VEHICLES, AND PORTABLE TESTERS WERE CONDUCTED ON FIVE SPECIALLY PREPARED SURFACES RANGING IN COEFFICIENT OF FRICTION FROM EXTREMELY LOW TO RELATIVELY HIGH. TWENTY-ONE AGENCIES COOPERATED IN THESE TESTS. SECONDARY EXPERIMENTS WERE CONDUCTED TO DETERMINE THE EFFECTS OF SUCH VARIABLES AS WATER FILM THICKNESS, CHANGES IN LOAD OF VEHICLES, OPERATOR EXPERIENCE, ETC. TEST DATA SHOW GOOD AGREEMENT AMONG TRAILERS THAT INCLUDED THREE DIFFERENT TYPES OF FORCE MEASURING SYSTEMS. SIZE OF PASSENGER VEHICLE, FROM COMPACT CAR TO BUS, DOES NOT WIDELY INFLUENCE THE ABILITY OF THE VEHICLE TO STOP DURING AN EMERGENCY SKID IF ALL VEHICLES UTILIZE THE SAME GENERAL TYPE OF TIRE TREAD AND A SIMILAR RUBBER COMPOSITION. THE TECHNIQUE AND EQUIPMENT USED IN MAKING STOPPING DISTANCE TESTS SHOULD BE STANDARDIZED BECAUSE OF THE WIDE DIVERGENCE OF RESULTS. A NEWLY DEVELOPED DRAG TESTER PARALLELLED THE VALUES OF THE VEHICULAR MACHINES ACROSS ALL SITES BETTER THAN DID THE OTHER PORTABLE TESTERS. THE NATIONAL CRUSHED STONE ASSOCIATION (NCSA) BICYCLE WHEEL AND THE DRAG TESTER GIVE MORE REALISTIC VALUES THAN DO THE BRITISH PORTABLE TESTERS. IT IS CONCLUDED THAT THE REMAINING SPREAD IN DATA IS STATISTICALLY SIGNIFICANT INDICATING MORE EFFORT NEEDED TO DEVELOP ACCURATE TRAILERS AND MEASUREMENT PRECISION.

  • Supplemental Notes:
    • No 366, 108 PP, 48 FIG, 63 TAB, 4 APP
  • Authors:
    • Dillard, J H
    • Mahone, D C
  • Publication Date: 1963

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  • Accession Number: 00206783
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 22 1994 12:00AM