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Illinois Motorcycle practice

Illinois Motorcycle: Alcohol, Drugs & Impairment practice test

Blood alcohol limits, zero-tolerance and implied-consent laws, and how alcohol and drugs — legal or not — affect your driving.

Content reviewed against official driver handbooks · August 12, 2026

13 questions · pass with 10 correct. You get instant feedback and an explanation after every answer.

Study questions with answers

12 sample Alcohol, Drugs & Impairment questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.

Show all 12 questions with answers
  1. 1. If you have two drinks within one hour, what is true at the end of that hour?

    Correct answer: At least one drink still remains in your system

    Because the body clears only about one drink per hour, after two drinks in an hour at least one drink still remains in your bloodstream.

    Source: Illinois Motorcycle Operator Manual — Alcohol and Other Drugs

  2. 2. About how quickly does the body eliminate alcohol?

    Correct answer: About one drink per hour

    Alcohol leaves the body at a rate of roughly one drink per hour, so drinking faster than that lets it build up in your bloodstream.

    Source: Illinois Motorcycle Operator Manual — Alcohol and Other Drugs

  3. 3. Which three things play the largest part in determining a rider's blood-alcohol concentration?

    Correct answer: How much you drink, how quickly you drink it, and what you weigh

    Quantity consumed, the speed at which it is consumed, and body weight are the three major determinants, although food intake, gender and physical condition can push the level higher still.

    Source: Illinois Motorcycle Operator Manual — Alcohol and Other Drugs

  4. 4. What is one of the best ways to keep a friend who has been drinking from riding?

    Correct answer: Arrange a safe alternative way for them to get home

    Arrange a safe ride by providing an alternative way home, and slow their drinking or keep them there until they are safe to travel.

    Source: Illinois Motorcycle Operator Manual — Alcohol and Other Drugs

  5. 5. Does spacing your drinks to one per hour guarantee your riding skills are unaffected?

    Correct answer: No, effects from drinking may still remain

    Even pacing yourself to one drink per hour, alcohol can still accumulate and the effects of drinking may remain; your judgment is one of the first things impaired.

    Source: Illinois Motorcycle Operator Manual — Alcohol and Other Drugs

  6. 6. Besides alcohol, what THC level in whole blood can make a driver legally under the influence in Illinois?

    Correct answer: 5 nanograms or more per milliliter

    You're considered under the influence with a THC reading at or above five nanograms in each milliliter of whole blood, among other thresholds.

    Source: Illinois Motorcycle Operator Manual — Alcohol and Other Drugs

  7. 7. Among riders killed in motorcycle crashes who had been drinking, how many were over the legal limit?

    Correct answer: About one-third of them

    Nearly half of riders killed had been drinking, yet only about one-third of those had a BAC above the illegal limit; the rest were impaired by just a few drinks.

    Source: Illinois Motorcycle Operator Manual — Alcohol and Other Drugs

  8. 8. In motorcycle crashes that involve drinking or drugs, how often is someone injured?

    Correct answer: In roughly nine crashes out of ten

    Roughly nine out of every ten such motorcycle crashes produce injuries, against about a third of comparable automobile crashes, because a rider has so little protection.

    Source: Illinois Motorcycle Operator Manual — Alcohol and Other Drugs

  9. 9. A DUI conviction in Illinois may require a BAIID. What is it?

    Correct answer: A breath-alcohol unit that your vehicle will not start without

    A breath-alcohol device can be ordered as part of the penalties for driving under the influence: the vehicle will not start until the driver supplies a breath sample through it.

    Source: Illinois Motorcycle Operator Manual — Alcohol and Other Drugs

  10. 10. In Illinois, what blood-alcohol concentration makes a driver legally under the influence?

    Correct answer: .08 or more

    A person is legally under the influence in Illinois at a BAC of .08 or more, though impairment starts well below that level.

    Source: Illinois Motorcycle Operator Manual — Alcohol and Other Drugs

  11. 11. What does Illinois law say about operating a vehicle with a controlled substance or intoxicating compound in your blood?

    Correct answer: It is unlawful no matter how small the amount detected

    Illinois bars operating a vehicle on its highways whenever any controlled drug, other regulated substance or intoxicating compound can be detected in the blood, so no permitted quantity exists.

    Source: Illinois Motorcycle Operator Manual — Alcohol and Other Drugs

  12. 12. How much alcohol can begin to affect your riding performance?

    Correct answer: As little as one drink

    Even a single drink can noticeably degrade how you ride, and your judgment slips well before you reach the legal limit.

    Source: Illinois Motorcycle Operator Manual — Alcohol and Other Drugs