Classification of aggregates by the skid resistance of bituminous concrete pavements. Pennsylvania SRL system. Paper prepared for the 55th Annual Meeting of the Transportation Research Board TRB, Washington, D.C., January 1976.

A system for classifying coarse aggregates according to their skid resistance performance in dense-graded bituminous concrete surface courses was developed. The purpose of this classification is to specify the permissible aggregates in such a way as to increase the likelihood that a new, dense-graded surface would have a skid number of 40 or greater throughout each succeeding year. The method used to determine the Skid Resistance Level ratings of aggregate sources is described.