But still, nobody has answers with a clear answer : does alcool impairs a driver more than marijuana does? yes or no... nobody answered as clearly, so that means something to me, people can't talk objectively of a subject that would go against their fondamental beliefs, which belief is not necesseraly controled by themself...
Depends on the dosage. I expect that for any given amount of alcohol, there is some amount of marijuana that is equally driving-impairing; but I wouldn't be a bit surprised if the degree of driving impairment from 'typical' use of marijuana (if any) is considerably less than that for 'typical' use of alcohol.