Crashes are up by as much as 6 percent in Colorado, Nevada, Oregon and Washington, compared with neighboring states that haven’t legalized marijuana for recreational use, new research from the Insurance Institute for Highway Safety (IIHS) and Highway Loss Data Institute (HLDI) shows. The findings come as campaigns to decriminalize marijuana gain traction with voters and legislators in the U.S., and Canada begins allowing recreational use of marijuana this month.
The two new studies will be presented at the Combating Alcohol- and Drug-Impaired Driving summit, hosted by IIHS and HLDI at the Vehicle Research Center. The summit brings together highway