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Michigan Impairment practice

Practice 41 Michigan DMV questions on impairment. Answer interactively below with an instant explanation after every question.

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Example questions & answers

1

For a driver aged 21 or older, what is the maximum legal blood alcohol concentration (BAC) allowed?

  • A.0.12%
  • B.0.80%
  • C.0.10%
  • D.0.08%✓

Why: For drivers who are 21 years of age or older, the legal limit for Blood Alcohol Content (BAC) is 0.08%. Exceeding this limit constitutes Operating While Intoxicated (OWI).

2

Which of the following is NOT a typical effect of marijuana on your driving ability?

  • A.Reduced ability to focus
  • B.Faster reaction time✓
  • C.Impaired night vision
  • D.Impaired sense of time, speed, and distance

Why: Marijuana impairs cognitive and motor functions essential for driving, specifically slowing down your reaction time rather than speeding it up. Therefore, a 'faster reaction time' is not a likely effect; the opposite is true.

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Practice material only — verify current rules with the Michigan Secretary of State.