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Alcohol

Drunk driving (or drink-driving in British English) is the act of driving under the influence of alcohol. A small increase in the blood alcohol content increases the relative risk of a motor vehicle crash. In the United States, alcohol is involved in 30% of all traffic fatalities. It is not known nationally how many people are killed each year in crashes involving drug-impaired drivers because of data limitations, but one study of drivers who were seriously injured in crashes found that 23.6% of drivers were positive for alcohol and 12.2% were positive solely for alcohol.