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How does alcohol affect driving performance?

Driving is a very complex task which requires complex decision making and total concentration. Alcohol affects a driver’s ability to be totally in control of his or her actions at:

  • 0.02 to 0.05 BAC – the ability to see or locate moving lights correctly is diminished, as is the ability to judge distances. The tendency to take risks is increased, and the ability to respond to several stimuli is decreased.
  • 0.05 to 0.08 BAC – the ability to judge distances is reduced, sensitivity to red lights is impaired, reactions are slower, and concentration span is shorter. At 0.08 BAC drivers are five times more likely to have an accident than before they started drinking.
  • 0.08 to 0.12 BAC – euphoria sets in, overestimation of one’s abilities leads to reckless driving, peripheral vision is impaired (resulting in accidents due to hitting vehicles in passing), and perception of obstacles is impaired. Drivers are up to  10 times more likely to have an accident.

6 Comments for this entry

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  • sami, February 6th, 2011 on 11:18 pm

    Excellent information, looking forward to my breathalyser in the mail, thanks drinking mate.

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