The Impact of Skid Resistance of Asphalt Layers on Road Accidents

One of the parameters related to the surface of asphalt layers that can be effective on road accidents is reduction of skid resistance in joint surface between a vehicle tire and asphalt layer. The relationship between skid resistance and crashes has been studied from years ago, while quantitive relations among these variables have not been determined completely. This article has reviewed the analysis of skid resistance impact on road accidents along with traffic statistics. In this study, using flat tires, skid resistance in wet conditions has been measured by locked wheel and compared with crashes rate in wet conditions. In addition, the impact of traffic volume on crashes rate has been investigated. This article has utilized the traffic information and statistics of one of the USA states as a case study. After collecting data, raw information has been processed and grouped and then additional statistics deleted. Crashes statistics in one-mile sections were calculated and divided on traffic volume of that section so that crashes rates can be evaluated. The least skid resistance in each section considered as skid resistance of that section. The analysis of results represents that there is a very proper statistics relation in viewpoint of skid resistance impact on crashes rate. As reducing friction number, crashes rate has been increased; although as expected, crashes rate cannot be modelled just by fraction number. Moreover analyzing relationship between crashes rate and traffic volume concludes that crashes rate has been reduced by increasing trafficvolume.