The number of drivers on the road with alcohol in their systems has declined by nearly one-third since 2007, but there has been a large increase in drivers using marijuana and other illegal drugs, a government report released Friday found.
The report by the National Highway Traffic Safety Administration said the share of drivers who test positive for alcohol has declined by more than three-quarters since the agency first began conducting roadside surveys in 1973.
–
Follow Joan Lowy on Twitter at http://www.twitter.com/AP_Joan_Lowy