A study of road friction in New South Wales

Experimental work in connection with the examination of several factors contributing to road friction is reported. This is an extension of an earlier investigation on the polishing of roadstone and road slipperiness. The experiments described include correlation tests between field and laboratory polishing, the effect of aggregate size on the measurement of coefficient of friction by a pendulum device, and the effect of the polishing process of aggregate of dry and wet abrading grit, etc, and a successful method of using aggregate susceptible to polishing in dense graded bituminous hot mix. Further attention has been given to the treatment of wooden and steel bridge decking to increase their skid resistance (A).