Prevalence of motor vehicle crashes involving drowsy drivers, United States, 1999-2008

► Information about driver drowsiness often is missing in crash data. ► The proportion of crashes involving drowsy drivers likely has been underestimated. ► Multiple imputation was used to address missing data in a representative sample. ► An estimated 16.5% of fatal crashes in the United States involve a drowsy driver. ► An estimated 7.0% of crashes in the United States involve a drowsy driver.