A study by the Traffic Injury Research Foundation found that, at BAC levels of .05 to .08, the risk of collision for drivers in the 20+ age group was about twice that of drivers with zero BAC. For young novice drivers (16- to 19 years of age) the crash risk at .05 to .08 was about eight times that of normal drivers!
A 1994 research document released by the National Highway Traffic Safety Administration also identifies impairment problems at .02 and states that "virtually all drivers are substantially impaired at .08 BAC.
For an idea of how much it takes to reach .08: four beers on an empty stomach in one hour for a 170 lb. man; three for a 137 lb. woman.
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