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Illinois Impairment practice

Practice 56 Illinois 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 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: Marijuana impairs your driving ability by slowing down your reaction time, rather than speeding it up. It acts as a depressant on the central nervous system, similar to how alcohol affects the body.

2

Which drug is most frequently found in drivers involved in crashes, following alcohol?

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

Why: Marijuana is the most frequently detected drug after alcohol in drivers involved in crashes. It significantly impairs judgment, motor coordination, and reaction time.

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