You should not be high and driving no matter what, but this study does little to make a case against pot. No idea how much thc in the people and the other drugs involved. Propaganda again. I will drive after the initial heavier buzz subsides, but even then rarely do. After an hour I am not very high no matter what I smoked.
For me pot does not make me less aware or mess with reactions but does tend to promote daydreaming which is not good, like focusing on something interesting I see rather than the road. Alcohol messes with reactions, coordination and causes a lack of fear, all bad news.
Doing concentrates and edibles is something else again. I could see a problem there.