Useless Junk of the Day

Marijuana improves driving ability?

Two decades of research show that marijuana use may actually reduce driver accidents.

The effects of marijuana use on driving performance have been extensively researched over the last 20 years. All major studies show that marijuana consumption has little or no effect on driving ability, and may actually reduce accidents. Here’s a summary of the biggest studies into pot use and driving.

A 1983 study by the US National Highway Transportation Safety Administration (NHTSA) concluded that the only significant affect of cannabis use was slower driving - arguably a positive effect of driving high.

A comprehensive 1992 NHTSA study revealed that pot is rarely involved in driving accidents, except when combined with alcohol. The study concluded that “the THC-only drivers had an [accident] responsibility rate below that of the drug free drivers.” This study was buried for six years and not released until 1998.

A 1993 NHTSA study dosed Dutch drivers with THC and tested them on real Dutch roads. It concluded that THC caused no impairment except for a slight deficiency in the driver’s ability to “maintain a steady lateral position on the road.” This means that the THC-dosed drivers had a little trouble staying smack in the center of their lanes, but showed no other problems. The study noted that the effects of even high doses of THC were far less than that of alcohol or many prescription drugs. The study concluded that “THC’s adverse effects on driving performance appear relatively small.”

A massive 1998 study by the University of Adelaide and Transport South Australia examined blood samples from drivers involved in 2,500 accidents. It found that drivers with only cannabis in their systems were slightly less likely to cause accidents than those without. Drivers with both marijuana and alcohol did have a high accident responsibility rate. The report concluded, “there was no indication that marijuana by itself was a cause of fatal accidents.”

In Canada, a 1999 University of Toronto meta-analysis of studies into pot and driving showed that drivers who consumed a moderate amount of pot typically refrained from passing cars and drove at a more consistent speed. The analysis also confirmed that marijuana taken alone does not increase a driver’s risk of causing an accident.

More in the link below. story here

If you enjoyed this post, make sure you subscribe to my RSS feed! Subscribe to Useless Junk of the Day by Email

Monday, March 17th, 2008 Filed under study |