Are you sure youre not mixing up the research that focused on CBD? It seems their research conflicts with your point.

I don't think thr Colorado Department of Transportation would make a statement like "There are many misconceptions about marijuana use, including rumors that it can’t impair your ability to drive or that it can actually make you a safer driver. Several scientific studies indicate that this is false" if their scientific studies said otherwise. https://www.codot.gov/safety/impaired-driving/druggeddriving/data