This final phase of the study is concerned with the effect of various water depths (obtained with a rain simulator) on the friction properties of various pavement textures at different levels of vehicular speeds and tire-tread depths, tire pressures, and tire types. Equations relating these variables are also developed and the relative effects of the variable determined. Tabular and figurative methods are utilized to present the results. Background information and pertinent past research pertaining to effects of water depth on pavement friction are given. Sixteen different types of surfaces were tested, including full scale prototypes and regular pavements built under normal contracts. The surfaces, located at the Texas A&M Research Annex, are 600 feet long and 24 feet wide. Friction tests were conducted on each surface at several water depths for various combinations of tire type, tire- tread depth, tire pressure, and vehicle speed. Multiple regression analyses were used to assess the effects of the variables on friction properties of the different surfaces. A series of twenty-five tables included in the report presents the summarized data of the study. Pavement water depth was found to significantly affect skid numbers at 60 mph. For a tire-tread depth of 0.31 in. and a texture of 0.033 in., increasing the water depth from 0.023 to 0.87 in. decreased the 60-mph skid numbers by 36 percent. Increases in tire-tread depth and surface texture increased skid numbers; whereas, increases in vehicle speed decreased skid numbers.

  • Supplemental Notes:
    • Research done in cooperation with DOT, FHWA. Research Study Title: "Vehicle-Pavement Interaction".
  • Corporate Authors:

    Texas Transportation Institute

    Texas A&M University System, 1600 E Lamar Boulevard
    Arlington, TX  United States  76011

    Texas State Department of Highways & Public Transp

    P.O. Box 5051
    Austin, TX  United States  78763
  • Authors:
    • Gallaway, B M
    • Rose, J G
    • Scott Jr, W W
    • Schiller, R E
  • Publication Date: 1974-8

Media Info

  • Pagination: 124 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00095736
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: Intrm Rpt.
  • Created Date: Jun 26 1975 12:00AM