Alcohol is involved in about 30% to 32% of all fatal traffic accidents in the United States. According to the National Highway Traffic Safety Administration (NHTSA), about 30% of all traffic crash fatalities involve drunk drivers with blood alcohol concentrations (BAC) of 0.08 g/dL or higher

. The Insurance Institute for Highway Safety (IIHS) reports a similar figure, stating that alcohol-impaired crash fatalities accounted for 32% of all crash fatalities

. Older data and other sources sometimes cite figures around 39% or 40%, but the most recent and consistent data from authoritative U.S. sources converge around the 30-32% range

. This means roughly one in three fatal crashes in the U.S. involve alcohol impairment. In summary, alcohol is involved in about 30% to 32% of fatal accidents in the United States.