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posted by n1 on Wednesday September 03 2014, @10:46PM   Printer-friendly
from the ridin'-dirty dept.

As states liberalize their marijuana laws, public officials and safety advocates worry that more drivers using the drug will lead to a big increase in traffic deaths. Now The Guardian reports that it appears that unlike alcohol, drivers using marijuana tend to be aware that they are impaired and try to compensate by driving slowly, avoiding risky actions such as passing other cars, and allowing extra room between vehicles. In Washington State, there was a jump of nearly 25% in drivers testing positive for marijuana in 2013 – the first full year after legalization – but no corresponding increase in car accidents or fatalities. When adjusted for alcohol and driver demographics, a study by the Pacific Institute for Research and Evaluation found that otherwise sober drivers who tested positive for marijuana were slightly less likely to have been involved in a crash (PDF) than drivers who tested negative for all drugs. “We were expecting a huge impact,” says Eduardo Romano, lead author of the study, “and when we looked at the data from crashes we’re not seeing that much.”

But another recent study that used similar data to assess crash risk came to an opposite conclusion. When Columbia University researchers compared drivers who tested positive for marijuana in a roadside survey with state drug and alcohol tests of drivers killed in crashes, they found that marijuana alone increased the likelihood of being involved in a fatal crash by 80% (PDF). But because the study included states where not all drivers are tested for alcohol and drugs, a majority of drivers in fatal crashes were excluded, possibly skewing the results. Also, the use of urine tests rather than blood tests in some cases may overestimate marijuana use and impairment. “We see the legalization of marijuana in Colorado and Washington as a wake-up call for all of us in highway safety,” says Jonathan Adkins. "We don’t know enough about the scope of marijuana-impaired driving to call it a big or small problem.

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  • (Score: 1, Flamebait) by velex on Thursday September 04 2014, @02:33AM

    by velex (2068) on Thursday September 04 2014, @02:33AM (#89178) Journal

    I agree with this. I'm admitting to being a drunk driver. Fine, flame me.

    I swear, though, these four-wheel drivers—egh, they're hopeless. I've never been pulled over because I never do anything stupid. I know my speed by what gear I'm in and what my engine sounds like. Even while wasted I can apply the Smith System (mostly, always leave yourself an out, and make sure they see you) better than most 4 wheel drivers can hope to while completely sober (and yakking on their cell phones). (Clarification: this is in my tiny little Fiesta. I'd probably end up creamed if I made a mistake^H^H^H^H^Hhad a collision (there are no accidents, only collisions) with one of these giant SUVs. Also, I'd never consider driving with a drop of alcohol in my blood if I ever were needed to haul 45,000 lbs of soda pop down the big road again.)

    Sure, perhaps, I'm experiencing the judgement-impairing effects of alcohol. It's funny, I'll drive my damned car to get more damned alcohol when I'm pissed, but I refuse to play Gran Turismo after my 2nd b33r because I know that my lap times decrease exponentially (well, ok, technically 1/x function) after that. It's Ballmer Peak where I have a brilliant lap, get in 1st, then it's downhill from there.

    That being said… given the times I have been high, I've always been afraid of taking to the wheel. The effects of cannabis are completely different from alcohol. I think it's important to research the safety profile, but I think in the end it's folly to apply the same enforcement methods to both drugs. They're totally different. Let objective science prevail, and let puritanism die in a fire.

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