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North Dakota Impairment practice

Practice 50 North Dakota DMV questions on impairment. Answer interactively below with an instant explanation after every question.

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Example questions & answers

1

What is the minimum alcohol concentration (AC) at which a driver who is 21 or older is legally considered under the influence?

  • A.0.02%
  • B.0.04%
  • C.0.06%
  • D.0.08%✓

Why: According to the driver's manual, if you are 21 or older, an alcohol concentration (AC) of 0.08% or higher means you are legally under the influence. Driving at or above this limit is illegal and carries severe penalties.

2

Which of the following is NOT a likely 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: The official manual states that "drugs and driving do not mix" because they impair your abilities. Marijuana slows down your reaction time rather than speeding it up, making it dangerous to operate a vehicle. Therefore, a faster reaction time is NOT a likely effect.

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Practice material only — verify current rules with the North Dakota Department of Transportation.