FACTORS AFFECTING VEHICLE SKIDS: A BASIS FOR WET WEATHER SPEED ZONING

AN ASSIMILATION OF FINDINGS, FROM VARIOUS RELATED SKID RESEARCH EFFORTS TO FORM A BASIS FOR EQUATING THE AVAILABLE FRICTION AT A SITE (PAVEMENT SKID RESISTANCE) TO THE EXPECTED FRICTION DEMAND FOR SELECTED MANEUVERS, ARE PRESENTED. FRICTION NORMALLY DECREASES WITH INCREASED SPEED. SINCE THE SPEEDS IN QUESTION ARE USALLY IN EXCESS OF 40 MPH, THE SPEED OF WHICH SKID NUMBERS ARE NORMALLY DETERMINED, THE CHANGE IN AVAILABLE FRICTION WITH RESPECT TO SPEED MUST BE CONSIDERED. NOMOGRAPHS AND CURVES ARE PRESENTED TO ILLUSTRATE THE CRITICAL SPEED FOR HYDROPLANING, STOPPING MANEUVERS, CORNERING MANEUVERS, PASSING MANEUVERS, EMERGENCY PATH-CORRECTION MANEUVERS, AND COMBINED MANEUVERS. A PROCESS IS RECOMMENDED BY WHICH WET WEATHER SPEED ZONING MAY BE IMPLEMENTED AT SELECTED SITES. A DESIGN PROCESS TO ESTABLISH THE WET WEATHER SPEED LIMIT IS DISCUSSED. /FHWA/

  • Corporate Authors:

    Texas State Department of Highways & Public Transp

    11th and Brazos Streets
    Austin, TX  USA  78701

    Texas Transportation Institute

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

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  USA  20590
  • Authors:
    • Weaver, G D
    • Hankins, K D
    • Ivey, D L
  • Publication Date: 1973-2

Media Info

  • Pagination: 73 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00206511
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: No 135-2 Res Rept
  • Files: TRIS, ATRI, USDOT, STATEDOT
  • Created Date: Jun 19 1973 12:00AM