Accident risk has been applied extensively in transportation safety analysis. Risk is often used to describe the level of safety in transportation systems by incorporating a measure of exposure, such as traffic flow or kilometers driven. The most commonly applied definition of accident risk states that risk is a linear function of accidents and traffic flow. This definition, however, creates pr...

Pavement frictional characteristics are commonly determined by conducting skid tests in accordance with ASTM Standard E274. The results of these tests [skid number (SN)] are used in ranking roads to establish construction priorities and to estimate tirepavement friction in accident analysis. The role of SN in these two applications is addressed. There are serious limitations constraining the us...

we are concerned: the number of road traffic fatalities is rising since 2014 again, in germany, in the european ::union::, in the usa, after a continuous decline over the last 40 years. many reasons are discussed:  human behaviour, e.g. texting while driving; no respect for traffic rules; daily life competition, who will be the fastest; more traffic, more vehicles, more kilometres driven. the i...