To make the roads really safe, we could test for excess caffiene, anger or limit vehicle power too??
From what I've seen with my own eyes, being around heavier users, very young and older stoners at The Daktory.... coordination and logical rationale seem to be absolutely fine for normal driving, with those drivers accustomed to the effects of grass, who are moderate. My pool game is now the best its ever been....and my table tennis is pretty mean. I'd say after 2 or 3 beers, neither my pool or ping pong would be very good, yet I could be under the limit for alcohol.
Most people do drive with some alcohol in their system. Having some cannabis in the system is probably less dangerous, especially as you could very well drive slower, with less aggression towards other road users.
Yet the prohibitionists would probably disagree.
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