"Of the many psychoactive drugs, licit and illicit, that are available and used by people who subsequently drive, marijuana may well be among the least harmful." Robbe, H. and O'Hanlon, J.,
Marijuana and Actual Driving Performance, Washington DC: Department of transportation (1993), p. 107.
See also: Hansteen, R.W., et al, "Effects of Cannabis and Alcohol on Automobile Driving and Psycho-motor Tracking", Annals of New York Academy of Sciences, 282: 240-56 (1976).
See also: Moskowitz, H., et al, "Marijuana: Effects on Simulated Driving Performance", Accident Analysis and Prevention 8: 45-50 (1976).
See also: Peck, R.C., et al, "The Effects of Marijuana and Alcohol on Actual Driving Performance", Alcohol, Drugs and Driving, 2: 135-54 (1986).
". . .either that cannabis. . .actually increases driving ability or. . .that drivers taking cannabis overcompensate for any loss of driving skills". Chait, L.D. and Pierri, J., "Effects of Smoked Marijuana on Human Performance: A critical Review", pp. 387-424 in Murphy, L. and Bartke, A. (eds),Marijuana/Cannabinoids: Neurobiology and Neurophysiology, Boca Raton: CRC Press (1992).
All these are a sample; there are plenty more.
If you wave your prejudices in everyone's faces without doing any research on their credibility, you just end up sounding ignorant.
Of the many psychoactive drugs, licit and illicit, that are available and used by people who subsequently drive, marijuana may well be among the least harmful." Robbe, H. and O'Hanlon, J., Marijuana and Actual Driving Performance, Washington DC: Department of transportation (1993), p. 107.It appears that taking a couple of tokes does impair your driving!
---------------------------from your source---------------
"Figure 1 [absent here] demonstrates that marijuana impairs driving performance as measured by an increase in lateral position variability: all three THC doses significantly affected sdlp relative to placebo<.012, .001 & .001, for the 100, 200 & 300 g/kg conditions, respectively. The Dose by Time effect was not significant indicating that impairment after marijuana was the same in both trials. Marijuana's effects on sdlp were compared to those of alcohol obtained in a very similar study by Louwerens et al. (1987). It appeared that the effects of the various administered THC doses (100-300 g/kg) on sdlp were equivalent to those associated with bacs in the range of 0.03-0.07 g%.