Collision claims in states that have legalized recreational marijuana have increased by as much as 6% from January 2012 through October 2017, according to new research from the Insurance Institute for Highway Safety (IIHS) and the Highway Loss Data Institute (HLDI). HLDI analysts estimate that the frequency of crash claims per insured vehicle year rose a combined 6% following the start of retail sales of recreational marijuana in Colorado, Nevada, Oregon and Washington, compared with the control states of Idaho, Montana, Utah and Wyoming. “The new IIHS-HLDI research on marijuana and crashes indicates that legalizing marijuana for all uses is having a negative impact on the safety of our roads,” says IIHS-HLDI president David Harkey.
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