The government, the police, and the other neo-prohibitionists suckered you into assuming that 40% of traffic deaths are caused by drunk drivers...but "alcohol related" means that any person involved in the accident, driver, passenger, or pedestrian, had a BAC of at least 1%. Also see Supercat's post 113 which puts that in context.
Correction: My statement "had a BAC of at least 1%" should have read "had a BAC of at least 0.01."