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This study compares the slipperiness characteristics of various pavement areas, some of which are not easily accessible to conventional road slipperiness measuring methods. In the study, the British portable tester was used to compare (1) slipperiness characteristics of wheel tracks with those of other lateral areas of the highway pavement, and (2) the characteristics of level tangents to those of other symmetrically shaped areas.
The 26 sites tested covered a wide range of surface types, textures, and coefficients of friction. From the data obtained, it was concluded that the coefficient of friction varies both longitudinally and laterally on a highway surface. The one steel deck bridge tested was found to be extremely slippery. The lowest coefficients of friction were noted in wheel paths, on paint lines, and on bleeding asphalt spots.
Mahone, D C
Highway research engineer, Virginia Council of Highway Investigation and Research, Charlottesville, Va.