Traffic deaths are down in Colorado, including those related to drunk-driving  Overall, fatal traffic deaths and injuries have dropped 63% in 7 years.
From a peak of 12,304 in 2001, the number of fatal and injury crashes plunged to 4,543 in 2007.
For alcohol related deaths and injuries, in the past year alone,
.... the number of highway injury and fatal crashes caused by drunken drivers fell to 254 from 1,031. "
As for the reasons, law enforcement credits "airbags; improved brakes, tires and stability control; greater use of seat belts; law enforcement; and drunken- driving laws."