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/

• Record URL:
  • https://library.ctr.utexas.edu/hostedpdfs/tti/135-2F.pdf
• Corporate Authors:

  Texas State Department of Highways & Public Transp

  11th and Brazos Streets
  Austin, TX  United States  78701

  Texas Transportation Institute

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

  Federal Highway Administration

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

Media Info

• Pagination: 73 p.

Subject/Index Terms

• TRT Terms: Critical velocity; Hydroplaning; Moisture content; Passing; Skid resistance; Speed limits; Speed zones; Steering; Stopping
• Uncontrolled Terms: Wet conditions
• Old TRIS Terms: Cornering (Vehicle); Critical speed
• Subject Areas: Highways; Pavements; Safety and Human Factors;

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