The prediction model for the ratio of skid numbers obtained with the ribbed E 501 test tire to those obtained with the blank E 524 test tire at any speed has been developed using data from 22 pavement test sites in Pennsylvania. The prediction is based on the Penn State Model for skid resistance-speed behavior. The model was developed as a function of a macrotexture parameter defined by sand-patch mean texture depth (MTD). An application of this model permits the prediction of the blank-tire skid number at any speed from a measured ribbed-tire skid number and a macrotexture measurement. A simplified model for the blank-tire skid number at 64 km/h (40 mph) test speed was also developed. Values calculated from both models show good agreement with each other as well as with the actual data. Another effort in this study was to relate skid resistance measured with both types of test tires to pavement texture. The results show a strong relationship between skid numbers with both test tires and pavement macrotexture and microtexture. Therefore, if a pavement skid-resistance survey is performed with both the blank E 524 and the ribbed E 501 test tires, the levels of macrotexture and microtexture can readily be estimated. The seasonal and short-term variations in data with the two tires also were compared. It was found that the short-term variations in the blank tire data do not pose at great a problem as those in the ribbed tire data.
Relationships Between Skid-Resistance Measurements with the Ribbed and Blank Test Tires, and Pavement Texture
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