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Oregon Impairment practice

Practice 51 Oregon 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 legal blood alcohol content (BAC) limit for drivers aged 21 or older?

  • A.0.11%.
  • B.0.09%.
  • C.0.12%.
  • D.0.08%.✓

Why: For drivers aged 21 and older, the legal limit for blood alcohol concentration (BAC) is under 0.08%. According to the manual, you will fail the chemical test if your BAC is 0.08% or higher.

2

Which of the following is not a typical effect of marijuana on a person's 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 slows down the central nervous system, leading to slower reaction times rather than faster ones. It also impairs focus, coordination, and the ability to judge distance and speed.

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