PREDICTION OF SKID RESISTANCE AS A FUNCTION OF SPEED FROM PAVEMENT TEXTURE MEASUREMENTS.

A model that can be used to describe the variation of skid resistance with vehicle speed is presented. The model contains two constants: One is a measure of low-speed skid resistance, and the other accounts for the decrease in skid resistance as vehicle speed increases. It is demonstrated that the constants can be predicted from measurements of pavement microtexture and macrotexture. A significant feature of the model is that it clearly separates the effects of the two texture types. It can also be used to determine skid resistance-speed characteristics from a single speed measurement and a macrotexture measurement.