Guard rail function efficiency in reducing road accidents based on pre and post studies

Up to now, many studies were done on the elements of road edges and the main factors of road accidents like human, vehicles, Atmosphere factors and roads, but there is no comprehensive research about the effect of security and road traffic control facilities on reducing accidents. To equip roads with security facilities and their standardization have an important effect on reducing road accident. The driver drives with high tranquility in standard road equipped with suitable signs and facilities for driving and will reach to his/her destination healthy. Statistics show that making roads standard is not just the omitting of dangerous points and making road flat but signs and security and physical alarming facilities are the main part of road security that complement standardization.