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Tire-pavement friction data were obtained for three tires using a pavement friction tester conforming to ASTM Method E 274. The ribbed E 501 test tire, the blank E 524 test tire, and a commercial passenger car tire of similar size and construction were tested. When new and slightly worn, the passenger car tire produces higher friction under the E 274 test conditions than does the ribbed tire. For greater water film thicknesses it is shown that the slightly worn passenger car tires produce friction levels between those of the two standard test tires.
Braking distance tests were performed with the slightly worn passenger car tires on a diagonally braked vehicle in accordance with ASTM Method E 503. The results are compared with a prediction of braking distance calculated from longitudinal friction data obtained with a pavement friction tester operated over the same site under the same water film conditions. The calculations provide a conservative estimate of braking distance for use in estimating stopping sight distance.
pavement friction, skid resistance, braking distance, stopping sight distance, tires
Professor of mechanical engineering, The Pennsylvania State University, University Park, Pa.