This paper reports the results of a set of tests from new york, pennsylvania, texas, and florida that were used to correlate skid number (sn) measurements made with astm ribbed and blank tires with sndata recorded at any speed (in other words, the calculation of sn at any speed from the determination of the sn/zero speed intercept and percent normalized gradient). Correlations were made with actual data at three or four speeds. Similarly, sn/zero speed intercept and percent normalized gradient were determined from transient tests of a ribbed-tire run at a single speed, and these results were correlated with the actual speed data. It was found that a transient skid test made with a ribbed tire at 40 or 50 mph, or a locked-wheel test with both the ribbed and blank tire at 40 mph, produced excellent results. Sn could be calculated over a range of 20 to 60 mph with a correlation better than 0.96 And as high as 0.99. This paper appears intransportation research record no. 1196, Pavement evaluation and rehabilitation.
Abstract