SKID TESTER TO MEASURE ROAD SKID RESISTANCE FOR CARS AND BICYCLES. ACADEMIC CONFERENCE PROCEEDINGS OF INTERNATIONAL CONFERENCE AND EXHIBITION ON ROAD TRANSPORT, BEIJING, CHINA, 7-12 MAY 1989

This paper presents the results of many years of roadway friction testing at speeds ranging from the low speeds of bicycles to highway speeds of automobiles and trucks. In many cases macrotexture and microtexture data are obtained with the friction. The data available are used to correlate macrotexture, microtexture, friction-speed gradient data, spinup and spindown tests, and blank-and-ribbed tire skid numbers. Linear correlations between texture measurements and skid numbers and friction-speed gradient data are determined. Based on these correlations, three measurement techniques are described for use in determining friction-speed parameters. These parameters can then be used to evaluate skid resistance for speeds over the range of interest from bicycles through cars and trucks. (Author/TRRL)