A team of economists who specialize in health and risk behaviors looked at the link between marijuana laws and traffic deaths, and found that roadway fatalities dropped significantly in states after they legalized medical marijuana. On average, deaths dropped 8 to 11 percent in the first full year after the law went into effect, and fell 10 to 13 percent by year four.posted by alms at 9:25 AM on March 28, 2014 [1 favorite]
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The researchers offer two possible explanations for why more marijuana use could lead to less drunken driving. One is that pot smoking takes place in different circumstances than drinking. Drinking is legal, and drinks are served in many places that can only be reached by car. People drink at bars, restaurants, ball games, picnics, concerts, and just about any adult social gathering; then they drive home. Because recreational marijuana is still illegal in all but two states, it¡¯s used in a much less open range of environments. In other words, people go out and drink, but stoners tend to stay home...
The other possible explanation is straightforward, if definitely not something you¡¯re likely to hear from your local chapter of DARE: It could be that pot availability leads to drunk drivers being replaced with stoned drivers, and that stoned drivers are, on average, safer. In fact, while studies indicate that pot is just as bad as alcohol for distance perception, reaction time, and hand-eye coordination, it appears to be less of a danger in simulated and real-world driving tests. Driving high is by no means safe: A meta-analysis by the British Medical Journal early in 2012 found that drivers who were high on marijuana had nearly double the risk of a serious crash compared to sober counterparts. But driving drunk is worse, causing a tenfold increase in accident risk for drivers with a blood-alcohol concentration at the legal limit of 0.08, or a forty-eightfold increase at the old legal limit of 0.1. The researchers also point out that drivers under the influence of marijuana may ¡°engage in compensatory behaviors¡± such as driving slowly, avoiding sudden, risky maneuvers, and staying well behind the car in front of them. Perhaps they are just more cautious than a drunk person would be, even though they are still impaired.
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posted by BitterOldPunk at 8:28 AM on March 28, 2014 [35 favorites]