Based on the results of the recent study (October 2003) by the coronial organization of Iran, this country at present time possesses the highest rate of the road accidents in the world. The rate of the increase of the said rate and caused losses are also incredible. During the summer 2003, 7933 persons were killed in Iran road accidents. This shows 20.5% increase in comparison to the previous year. The similar rate of increase for injuries, during the said period was even worse; equal to 34.1%. The results of a study using TRL-MAAP model are presented in this paper. In this study the rural road accidents' data of the province of Khorasan (the biggest province of Iran, with about a fifth of the country's area and a tenth of its 66 million population) is analyzed. The results show that the rates of heavy vehicles' rural road accidents are highest in comparison with the medium size trucks and small size passenger cars, ranging from 440 accidents per 1000 vehicles per year for buses, 639 for mini-buses and 665 for heavy trucks and trailers. These are caused by many shortcomings in the country's transportation infrastructure, heavy vehicles' crashworthiness, professional drivers' training, law enforcement, drowsiness, fatigue and drug epidemic among heavy vehicles' drivers together with the country's economic upheaval in recent years. But among all different causes, the analysis shows that drowsiness and fatigue are the most frequent and most alarming causes of the said scenario. Here, the specific reasons for the spread of this epidemic impairing societal problem in Iran, is discussed and the remedial solutions are presented. Key Words: fatigue, driver, road, accident, heavy vehicle, Iran.

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