Edit: Never mind, got 'em. Here's Colorado's own numbers: https://www.codot.gov/safety/traffic-safety/assets/fatal-cra...

Notice that fatalities are up significantly, but so are vehicle miles traveled. In fact, in 2013, Colorado had .0075 fatalities per million miles driven. In 2019, that number was... .0075. In other words, your likelihood of dying per distance driven was almost exactly equal to 2013.

This are the CO government's numbers, not mine or anyone else's.

I don't have a dog in this hunt. I'm not from Colorado, and I don't use marijuana. But it's really hard to say that legalizing marijuana in CO had any affect on traffic safety at all, when the fatality rate is essentially identical afterward.