|English: An advisory sign on Interstate 15 in Utah near Mt. Nebo. It reminds drowsy drivers to get off the freeway. (Photo credit: Wikipedia)|
As many as 7,500 fatal motor vehicle crashes in the United States each year might involve drowsy driving, and 4.2% of adult respondents to a 2009–2010 survey reported falling asleep while driving at least once during the previous 30 days. Adults who reported usually sleeping ≤6 hours per day, snoring, or unintentionally falling asleep during the day were more likely to report falling asleep while driving than adults who did not.