The legalization of marijuana in Colorado and Washington hasn’t led to an increase in traffic fatalities, according to a study published this week by the National Bureau of Economic Research.

Researchers at the University of Oregon compared traffic accident outcomes in Colorado and Washington following legalization to other states with similar pre-legalization economic and traffic trends. “We find that states that legalized marijuana have not experienced significantly different rates of marijuana- or alcohol-related traffic fatalities relative to their synthetic controls.”

They continue; “In summary, the similar trajectory of traffic fatalities in Washington and Colorado relative to their synthetic control counterparts yield little evidence that the total rate of traffic fatalities has increased significantly as a consequence of recreational marijuana legalization.”

According to Armentano, Deputy Director of NORML, the study’s findings are similar to those of a 2017 study published in The American Journal of Public Health which reported, “Three years after recreational marijuana legalization, changes in motor vehicle crash fatality rates for Washington and Colorado were not statistically different from those in similar states without recreational marijuana legalization.”

A 2016 study reported that the enactment of medical cannabis legislation is associated with an immediate decline in traffic fatalities among younger drivers.

Full text of the study, click here.