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Idaho Impairment practice

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

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Example questions & answers

1

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 significantly impairs a driver's abilities, including slowing down reaction times. Therefore, 'faster reaction time' is not a likely effect; instead, it's the opposite.

2

Aside from alcohol, what is the second most frequent drug found in drivers involved in crashes?

  • A.cocaine.
  • B.cold or allergy medications.
  • C.marijuana.✓
  • D.pain relievers.

Why: According to driving statistics and the manual, marijuana is the second most common drug found in drivers involved in accidents, ranking right after alcohol. It is frequently detected in crash investigations because it is widely used and significantly impairs driving skills.

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