برآورد سهم منتسب جمعیتی سرعت و سبقت غیرمجاز در محورهای برون‌شهری ایران

Background & Objectives: In the chain of vehicles, human and environment, the human factors are the most complex element in the causes of road traffic injuries (RTIs). Unauthorized speeding and overtaking are considered as the main human factors resulting RTIs. This study estimated the population attributablefraction of two human factors, the most common risk factors of rural roads, of RTIs. Methods: To calculate the population attributable risk, the prevalence of unauthorized speeding and overtaking registered in Police data was employed. Effect size related to odds ratio was employed using Logistic regression. Joint effect of related risk factors also calculated and reported. Dasta were taken from national traffic police using the KAM 114 froms. Results: The percentage of population attributable risk of unauthorized speeding for deaths at crash scene was 20.9 and for injured cases was 16.6. These values were 13.5 and 13.4 for unauthorized overtaking respectively. Corresponding for joint effects the population attributable risk was 31.6 for deaths and 27.8 for injuries. Conclusion: The results illustrate the importance of speed control and unauthorized overtaking as a priority of RTIs in Iran. It is recommended that related laws and legislations should be pursued more seriously, and followed by more effectively.