Introduction : in any car accident four factors may be involved: human factor, road, vehicle and environment. About 90 to 95 percent of car accidents in Iran are caused by human factor which could be pointed out as driving errors, traffic misconception, tiredness, drowsiness, drug and alcohol consumption driving in dark hours (late night, early morning, and after lunch), youngsters' driving, specially at late night weekends and while they are accompanied by their pals. Method: this is a library method study which also looks to the results obtained from the researches administered in Iran and the world organizations on car accidents. Findings: comparing the rate of car crashes between Iran and other countries reveals a 55% growth of car accidents in Iran during 1993 – 1995. Also the mean score of the car accident victims in Iran is many times higher than other countries. Most of the victims are among the pedestrians in active age-group- 20 to 50 years old. Results: to prevent car accidents, an educational programme has been suggested for students, drivers and pedestrians.