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

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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.