In her article, Janet Creaser points out that alcohol intoxication is a significant risk factor for fatal traffic crashes. Consequently, there is sparse research on the impairing effects of alcohol on skills and handling in motorcycle control. In 2007, 32% of the 41,059 total traffic fatalities in the U.S. involved an alcohol impaired rider with a blood alcohol content (BAC) greater than 0.08g/dl (NHTSA, 2008). It is the reason (alcohol) why there is more frequent motorcycle crashes than any other vehicle operation. (NHTSA, 2006). In a recent simulator study that the most common error for an intoxicated operator at BAC ranges from 0.038 to 0.059g/dl was to "run-off-road", particularly when negotiating curves (Colburn et al., 1993). People in the study also showed reckless and inappropriate speeds. At conclusion of the study, the authors made note that even the most basic motorcycle handling skills were impaired at the 1993 per se legal limit of 0.10 g/dl and henceforth concluded that the results supported their hypothesis that the "legal alcohol level" should be lowered for motorcycle riders. As a result of the study, the legal limit for all motorcycle operators has been lowered to 0.08 g/dl in all 50 states.
http://www.sciencedirect.com/science/article/pii/S0001457509000840
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