<p>Like I said, please direct me to studies that conclude driving stoned is more dangerous than driving drunk, and that driving stone significantly impairs drivers. ~ Tiff90</p>
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<p>Again, as previously stated I (nor anyone in this discussion) has said it’s more dangerous than alcohol. So can you just drop it?</p>
<p>However, just because it’s less dangerous than alcohol, doesn’t mean it’s safe.</p>
<p>[Marijuana</a> And Actual Driving Performance](<a href=“http://www.druglibrary.org/schaffer/misc/driving/driving.htm]Marijuana”>Marijuana And Actual Driving Performance)</p>
<p>“The results of the studies corroborate those of previous driving simulator and closed-course tests by indicating that THC in inhaled doses up to 300 g/kg has significant, yet not dramatic, dose-related impairing effects on driving performance (cf. Smiley, 1986). Standard deviation of lateral position in the road-tracking test was the most sensitive measure for revealing THC’s adverse effects. This is because road-tracking is primarily controlled by an automatic information processing system which operates outside of conscious control. The process is relatively impervious to environmental changes but highly vulnerable to internal factors that ■■■■■■ the flow of information through the system. THC and many other drugs are among these factors. When they interfere with the process that restricts road-tracking error, there is little the afflicted individual can do by way of compensation to restore the situation. Car-following and, to a greater extent, city driving performance depend more on controlled information processing and are therefore more accessible for compensatory mechanisms that reduce the decrements or abolish them entirely.”</p>
<p>“Although THC’s adverse effects on driving performance appeared relatively small in the tests employed in this program, one can still easily imagine situations where the influence of marijuana smoking might have a dangerous effect; i.e., emergency situations which put high demands on the driver’s information processing capacity, prolonged monotonous driving, and after THC has been taken with other drugs, especially alcohol. Because these possibilities are real, the results of the present studies should not be considered as the final word. They should, however, serve as the point of departure for subsequent studies that will ultimately complete the picture of THC’s effects on driving performance.”</p>
<p>[Marijuana</a> /Alcohol Driving Study – DOT HS 808 939](<a href=“http://www.druglibrary.org/Schaffer/Misc/driving/Marijuana%20-Alcohol%20Driving%20Study%20--%20DOT%20HS%20808%20939.htm]Marijuana”>Marijuana /Alcohol Driving Study -- DOT HS 808 939)</p>
<p>"In a previous series of studies on the effects of THC alone we concluded that THC given in doses up to 300 1lg/kg has “slight” effects on driving performance (Robbe & O’Hanlon, 1993). The results of the present study now compel us to revise that conclusion. The present subjects’ performance was more affected than their predecessors’. The present subjects showed impaired car following performance after THC 100 1lg/kg whereas the previous ones were not impaired by doses up to 300 1lg/kg. In the present study, road tracking performance after 200 ~g/kg was worse than the performance after 300 ~g/kg in the previous study. We believe that these differences are attributable to the groups’ respective experience with THC smoking and to driving under the influence of THC. The present group was less experienced and probably had not developed the same degree of behavioral tolerance as their predecessors. Yet all of the individuals in both groups admitted to having occasionally driven under the influence of THC before entering the studies. Thus, the new data seem no less representative of how drivers normally operate under the influence of THC. The addition of these data to those previously collected merely broadens the range of reactions that might be expected to occur in real life. That range has not been shown to extend into the area that can rightfully be regarded as dangerous or an obviously unacceptable threat to public safety. Alcohol present in blood concentrations around the legal limit (0.10 g/dl) in most American States is more impairing than anything subjects have shown after THC alone in our studies. As mentioned, medicinal drugs have had worse effects on psychiatric patients’ driving performance in other studies employing the same test procedures. If not blatantly dangerous, however, the effects of THC alone in this study were certainly more than slight. They were of sufficient magnitude to warrant concern. Drivers suffering the same degrees of impairment as the present subjects did after THC alone would be less than normally able to avoid collisions if confronted with the sudden need for evasive action. They would probably also be more likely to fall asleep during prolonged vehicle operation. In short, while the effects of THC alone in doses up to 200 1lg/kg might be categorized as “moderate” in the tests, they could easily become “severe” under exceptional circumstances. </p>
<p>The subjects’ reactions to combined use of alcohol and THC are another matter. Drivers suffering the same degrees of impairment as the present subjects did after THC and alcohol, combined, would be exceedingly dangerous. Their impairment would be a serious threat to their own safety, and perhaps to the general driving public as well. The simultaneous consumption of low to moderate doses of alcohol and THC, rendered the present subjects incapable of safe driving for several hours thereafter. That they were able to safely"</p>