Daniel Rees, professor of economics at the University of Colorado Denver & D. Mark Anderson, assistant professor of economics at Montana State University quote from a recent study on medical marijuana effect on road traffic fatalities

"Our research suggests that the legalization of medical marijuana reduces traffic fatalities through reducing alcohol consumption by young adults...Our results suggest a direct link between marijuana and alcohol consumption...Although we make no policy recommendations, it certainly appears as though medical marijuana laws are making our highways safer"