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FHWA Home / Safety / Roadway Departure / Low Cost Treatments for Horizontal Curve Safety

Skid Accident Reduction Program

This Technical Advisory was canceled by Technical Advisory 5040.38, “Pavement Friction Management” on June 17, 2010.

T 5040.17

December 23, 1980

U.S. Department of Transportation
Federal Highway Administration


Figure A- 1

PERCENT OF THE PAVEMENT IS WET

Map - Percent of Time Pavement is Wet

Back to Skid Accident Reduction Program


Wet condition assumed when hourly rainfall > 0.011.

Values based on 11 year average (1957-1967).

1“A Method to Determine the Exposure of Vehicles to Wet Pavements,” by James I. Karr, california Business and Transportation Agency, Department of Public Works, Division of Highways, January 1972.

Page last modified on June 20, 2011.
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