16% of motorists may be under the influence of drugs during weekends - one in six cars

Motorists under the influence of drugs are a growing threat on U.S. roads. If you think about driving on a Friday or Saturday evening about 16% of the vehicles - one in six of the cars - the driver will be under the influence of an illicit or licit drug.

"Drugged driving" hampers judgment, reaction time, driving skills and memory.

Video: "Fall down alcohol test".

References:

U.S. says drugged driving growing threat. Reuters.

Am I driving a car? Drunk motorist stuns police http://goo.gl/D9NOa
Drunk Driving, Distracted Driving, Moralism, and Public Health - NEJM
30% of U.S. adults have been arrested by age 23: study. Reuters, 2011.