National Traffic Safety Administration
February 6, 2015

This news release highlights two recent studies by the National Highway Traffic Safety Administration (NHTSA) that show that while the number of drunk drivers on the road has decreased, the decline has been offset by increases in the number of those driving under the influence of marijuana and prescription drugs. The agency said that the number of drunk drivers has fallen by almost a third since 2007, but a 2014 survey indicated that nearly one driver in four tested positive for a drug that put them or others at risk. The voluntary and anonymous survey was conducted to collect information from regions across the U.S. Signs along the road informed drivers that they were nearing a data collection site and that those who wished to participate should stop. The 2014 survey showed that approximately 8 percent of drivers on weekend nights had alcohol in their bloodstreams, with slightly more than 1 percent exceeding the legal limit. NHTSA said the number of inebriated drivers in 2014 was 30 percent lower, compared with the 2007 survey and 80 percent lower compared with the first survey in 1973. In contrast, the number of drivers with drugs in their system increased from 16.3 percent in 2007 to 20 percent of drivers during the nighttime on weekends. The number of drivers with marijuana in their systems was nearly 50 percent higher.  More studies continued Here
Used with permission of iii.org
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NHTSA releases two new studies on impaired driving on U.S. roads