Traffic Laws

Study questions with answers

12 sample Traffic Laws questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.

1. 1. A driver is placed out of service for 24 hours for consuming alcohol within how many hours before operating a CMV?

   Correct answer: 4 hours

   Drinking alcohol within four hours before operating a CMV results in a 24-hour out-of-service order.

   Source: Michigan CDL Manual, Section 1 (Serious alcohol violations)

2. 2. What happens to a first-time CDL applicant who is caught cheating or lying on the application?

   Correct answer: Denial of a new application for 60 days

   A new applicant who cheats or lies on the application is denied a new application for 60 days.

   Source: Michigan CDL Manual, Section 1 (What tests do I need)

3. 3. What is true about triple-trailer combinations in Michigan?

   Correct answer: They are not permitted in Michigan

   While the T endorsement covers double and triple trailers, triple-trailer combinations are not allowed on Michigan roads.

   Source: Michigan CDL Manual, Section 1 (Endorsements)

4. 4. A driver is ordered out of service for 24 hours when found with a bodily alcohol content of at least what level?

   Correct answer: 0.015

   A bodily alcohol content of 0.015 or more triggers a 24-hour out-of-service order, well below the 0.04 that is a major violation.

   Source: Michigan CDL Manual, Section 1 (Serious alcohol violations)

5. 5. Under Michigan's implied consent law, what has any CDL holder already agreed to?

   Correct answer: Chemical testing for alcohol or drugs when operating a motor vehicle

   By operating a motor vehicle, a CDL holder is deemed to have consented to chemical testing for alcohol or drugs.

   Source: Michigan CDL Manual, Section 1 (Implied Consent)

6. 6. A tank (N) endorsement is required for a tank with an individual capacity above 119 gallons and an aggregate capacity of at least how much?

   Correct answer: 1,000 gallons

   The tank endorsement applies when a single tank exceeds 119 gallons and the tanks together are rated to hold 1,000 gallons or more, hazardous or not.

   Source: Michigan CDL Manual, Section 1 (Endorsements)

7. 7. The seasonal restricted CDL lets agri-business drivers haul diesel motor fuel up to what quantity without an H or X endorsement?

   Correct answer: 1,000 gallons or less

   Under the seasonal restricted CDL, diesel fuel may be hauled up to 1,000 gallons without an H or X endorsement.

   Source: Michigan CDL Manual, Section 1 (Seasonal restricted CDL)

8. 8. Under federal regulations, what is a CMV driver prohibited from doing while driving in interstate commerce?

   Correct answer: Manually entering or reading text on an electronic device

   Texting, defined as manually entering or reading text on an electronic device, is banned while driving a CMV.

   Source: Michigan CDL Manual, Section 2.9.5 (Texting)

9. 9. If your driving privilege is suspended, by when must you notify your employer?

   Correct answer: By the end of the next business day

   A license suspension, revocation, or other loss of privilege must be reported to the employer by the end of the next business day after you are notified.

   Source: Michigan CDL Manual, Section 1 (Notification of convictions)

10. 10. Federal rules restrict CMV drivers from using hand-held mobile phones. A second conviction within three years disqualifies the driver for how long?

    Correct answer: 60 days

    A second hand-held phone conviction within three years brings a 60-day disqualification; three or more within three years brings 120 days.

    Source: Michigan CDL Manual, Section 2.9.4 (Cell/Mobile phones)

11. 11. Michigan's move-over law requires a driver approaching a stopped emergency vehicle on the roadside to do what?

    Correct answer: Slow down and, if safe, move into a lane not next to the emergency vehicle

    You should slow down and, when safe, move into a lane that is not next to the stopped emergency vehicle or work zone.

    Source: Michigan CDL Manual, Section 2.8.2 (Move-over laws)

12. 12. What is the minimum age to transport hazardous materials in quantities that require placards?

    Correct answer: 21

    Hauling placardable hazardous materials requires the driver to be at least 21 years old.

    Source: Michigan CDL Manual, Section 1 (How old must I be)