U.S. Government Studies Marijuana Driving Performance
Marijuana And Actual Driving Performance
U.S. Department of Transportation,
National Highway Traffic Safety Administration
(DOT HS 808 078), Final Report, November 1993
THC's effects on road-tracking after doses up to 300 g/kg never exceeded alcohol's at bacs of 0.08 g%; and, were in no way unusual compared to many medicinal drugs' (Robbe, 1994; Robbe and O'Hanlon, 1995; O'Hanlon et al., 1995). Yet, THC's effects differ qualitatively from many other drugs, especially alcohol. Evidence from the present and previous studies strongly suggests that alcohol encourages risky driving whereas THC encourages greater caution, at least in experiments. Another way THC seems to differ qualitatively from many other drugs is that the former's users seem better able to compensate for its adverse effects while driving under the influence.
- Marijuana smokers are aware of their limitations, are more cautious, and able to compensate.
- High doses of marijuana never exceed alcohol’s minimal effects!
- Marijuana effects are comparable to many prescription drugs.