Abstract: Source: International Journal of Respiration, Vol. 27, No. 20, 2007 Obstructive sleep apnea hypoventilation syndrome (OSAHS) can impair cognitive functions such as responsiveness and alertness. It was found that OSAHS drivers were significantly more likely to be involved in motor vehicle accidents than non-OSAHS drivers; with effective treatment OSAHS patients’ accident risk returned to the level of the non-OSAHS population; the incidence of drowsiness and the prevalence of OSAHS were significantly higher in commercial drivers than in the general population. Therefore, the active prevention, detection, diagnosis and treatment of OSAHS among motorists are of great value to the health and safety of individual drivers and to the traffic safety of society.