With increasing the length and number of rural roads network and the increasing of car ownership in the country's villages, unfortunately the number of accidents has increased in these ways. In this study, the first, about the effecting factors of severity roads crashes are discussed. Then by using statistical of rural roads accident for ILAM province (ILAM one province of IRAN) from police’s reports (2009-2012), Characteristics of geometric design (radius of curvatures, width of roads...