First off: don’t drive high. These guys are on a closed course, and are supervised by police officers. And you see how many traffic cones they demolish. Not only is it reckless and a potential danger to you and others, the laws around driving while under the influence of any substance are very very strict now. If you plan to enjoy legal cannabis, do so responsibly and respectfully. Cool? Cool.
Now enjoy a video of a bunch of idiots getting stoned out of their minds and trying to drive. It’s not purely scientific, but it does at least give you a basic comparison of how long the course took from sober to stoned.