dlorde
Philosopher
- Joined
- Apr 20, 2007
- Messages
- 6,864
I don't believe there is evidence to back this up. I have searched pretty thoroughly and to my knowledge, there have been no credible studies looking at the effect of cannabis on driving ability.
If you know of something along these lines, please pass it along.
I remember reading a Northern European study (Scandinavian?) some years ago with students on a driving simulator, comparing the effects of cannabis and alcohol. The results showed that while both negatively affected reaction times, alcohol tended to cause faster, overconfident driving, cannabis tended to result in slower, more cautious driving. This made the cannabis risk factor almost equal to normal under undemanding driving conditions, and the alcohol risk factor considerably higher. However, in demanding conditions, both resulted in impaired decision making. I would guess that performance in an emergency would be poor with both cannabis and alcohol, but I don't think they tested that.
Sorry I don't have a link, but I read it online, so it ought to be out there somewhere...