Abstract
This paper is a report of a phase of some of the variables involved in pavement slipperiness. This paper includes the following factors: 1. The polishing characteristics of different mineral aggregates in both portland cement and bituminous concrete mixtures, and the relation to basic aggregate properties; 2. the effect of texture, as determined by gradation on the anti-skid characteristics of bituminous mixtures; 3. The effect of initial aggregate shape or degree of harshness on the skid resistance of bituminous mixtures.