Weather has a broad and major impact on the safety, mobility and productivity of the nations’ roadways and results in substantial costs for the governments and the private agencies responsible for maintaining the roads. Weather causes visibility impairments, precipitation (snow or rain), high winds, and temperature extremes which affect driver behaviour, vehicle manoeuvrability, pavement friction, road flow, roadway infrastructure and maintenance.Accurate weather data analysis is instrumental to provide reliable safety information on the road conditions to both road operators and drivers.