PAVEMENT FRICTION NEEDS

SKID TRAILER AND STOPPING-DISTANCE TESTS WERE PERFORMED AT 61 SITES TO ESTABLISH A CORRELATION BETWEEN VIRGINIA'S SKID TRAILER AND THE STOPPING-DISTANCE CAR. THE REGRESSION ANALYSES PERFORMED INDICATE THAT THE TRAILER AND THE CAR ARE EQUIVALENT AT A SKID NUMBER OF 30; HOWEVER, AS THE PAVEMENT FRICTION INCREASES, THE TRAILER GIVES PROGRESSIVELY HIGHER NUMBERS THAN THE CAR. THE RELATIONSHIP BETWEEN ACCUMULATED TRAFFIC VOLUMES AND FRICTION LEVELS WERE DETERMINED BY CONDUCTING TESTS AT 46 SITES. IT WAS FOUND THAT (A) BITUMINOUS MIXES MANUFACTURED FROM POLISH-RESISTANT MATERIALS STILL HAD HIGH SKID RESISTANCE AFTER 30 MILLION VEHICLE PASSES, (B) PORTLAND CEMENT CONCRETE SURFACES MANUFACTRED FROM SILICA SANDS HAD LOST MUCH OF THEIR SKID RESISTANCE AFTER 25 MILLION PASSES, AND (C) BITUMINOUS MIXES MANUFACTURED FROM LIMESTONE APPROACHED A SLIPPERY CONDITION AFTER FEWER THAN 2 MILLION VEHICLE PASSES. A TOTAL OF 312.8 MILES, 521 SECTIONS, ON VIRGINIA'S INTERSTATE SYSTEM WERE STUDIED TO DETERMINE THE RELATIONSHIP BETWEEN THE PERCENTAGE OF WET PAVEMENT ACCIDENTS AND THE PREDICTED STOPPING-DISTANCE SKID NUMBERS. THE SITES WERE SEPARATED INTO FOUR CATEGORIES: OPEN ROADWAY, NON-OPEN ROADWAY, OPEN INTERCHANGES, AND NON-OPEN INTERCHANGES. IT WAS FOUND THAT THE MINIMUM PREDICTED STOPPING-DISTANCE SKID NUMBER FOR THE TRAFFIC AND PASSING LANES OF INTERSTATE ROADWAYS WITH MEAN TRAFFIC SPEEDS OF 65 AND 70 MPH SHOULD BE 42 AND 48 RESPECTIVELY. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Appendices; Figures; References; Tables;
  • Pagination: pp 1-11
  • Monograph Title: Pavement friction characteristics and water depths
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00207473
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Feb 23 1973 12:00AM