I would like to point out that I have driven under the influence of alcohol before. Marijuana as well, but on different occasions. I can say from first hand experience, that driving while stoned caused me to be even more cautious of my surroundings and my speed had always stayed at or below the speed limit.

Driving under the influence of alcohol is a completely different experience. I took greater risks and sped often. I would be so much more comfortable driving next to a person stoned, than a person drunk.

I do not condone driving under either influence. I am just relating personal experience with what I had done in the past. I no longer drive drunk or stoned. Neither experience involved any hard lessons or anything, I just don't.