Purpose:In Iran,the most common cause of injuries and the second leading cause of deaths are traffic accidents,and those problems impose a substantial financial burden on the society.This study aims to determine traffic accident mortality trends and their epidemiologic characteristics in the Kermanshah province,west of Iran.Methods:In a cross sectional study,road traffic fatality data from 2004 to 2013 were analyzed to determine the epidemiological patt of traffic accident mortality.Trend assessment was performed to ascertain the decreasing or increasing status.Chi-square and one-way analysis of variance (ANOVA) tests,as well as Poisson regression were used to determine the significance of the data in time.Data were analyzed using Excel and statistical package of SPSS version 19.Results:Out of 5110 people that died in traffic accidents,4024 (78.7％) were males.The state of accidents indicated that 404 (43.8％) female pedestrians died as a result of car crashes,and 1330 (41.4％) males died because of car collisions.1554 (31.9％) deaths happened to pedestrians and 1556 (32.1％) to vehicle drivers,and the rest belonged to vehicle passengers.Head trauma was the cause of death for as much as 3400 (69.9％) cases.Fatal crashes in which pedestrians were involved mostly occurred between the hours 13:00 to 15:00,while the time for vehicle drivers was between 16:00 to 18:00.2882 people (59.1％) died before reaching to health care facilities.Traffic crash mortality trend for pedestrians follows a linear patt with a gentle downward slope,but the trend shows various swings when it comes to vehicle drivers.Conclusion:The number of traffic crash deaths from 2004 to 2013 indicates a decreasing trend in two groups of road users:vehicle drivers and car occupants.This can be due to some interventions such as modification of traffic rules and enhancement of police control which has been implemented in recent years.Moreover,more attention should be paid to promote the optimal health care services to save the lives of the injured from traffic accidents.