When do alcohol-impaired driving crashes occur?

They happen at all hours, but alcohol involvement in crashes peaks at night and is higher on weekends than on weekdays. Among passenger vehicle drivers who were fatally injured between 9 pm and 6 am in 2007, 60 percent had BACs at or above 0.08 percent compared with 20 percent during other hours. Forty-seven percent of all fatally injured drivers on weekends (6 pm Friday to 6 am Monday) in 2007 had BACs at or above 0.08 percent. At other times the proportion was 26 percent.