Fitness, Fatigue & Compliance

5 free sample questions of the 35 in this topic. The full set is in the app.

1. Question 1

   Federal rules on fatigue say a driver may NOT operate a CMV when:

   • A.Their ability or alertness is impaired — or likely to become impaired — by fatigue, illness, or any other cause
   • B.They have driven more than 100 miles that day
   • C.They feel slightly bored
   • D.It is past midnight
   Show answer & explanation

   Answer: A. Their ability or alertness is impaired — or likely to become impaired — by fatigue, illness, or any other cause

   §392.3 bars operating while impaired by fatigue or illness — and bars carriers from requiring or permitting it.

   Source: 49 CFR Part 392 — Driving of Commercial Motor Vehicles — §392.3 — Ill or fatigued operator

2. Question 2

   The one exception to the ill/fatigued-operator rule is:

   • A.A grave emergency, where stopping would increase the hazard — drive only to the nearest safe place
   • B.Deliveries running late
   • C.Trips under 50 miles
   • D.Team-driver operations
   Show answer & explanation

   Answer: A. A grave emergency, where stopping would increase the hazard — drive only to the nearest safe place

   If compliance itself would increase the danger to occupants or other road users, the driver may continue — but only to the nearest place the hazard ends.

   Source: 49 CFR Part 392 — Driving of Commercial Motor Vehicles — §392.3 — Grave emergency exception

3. Question 3

   How long before going on duty is alcohol use prohibited?

   • A.4 hours
   • B.2 hours
   • C.8 hours
   • D.24 hours
   Show answer & explanation

   Answer: A. 4 hours

   §392.5: no alcohol use — and no being under its influence — within 4 hours before going on duty or operating (or having physical control of) a CMV.

   Source: 49 CFR Part 392 — Driving of Commercial Motor Vehicles — §392.5(a)(1) — Alcohol prohibition

4. Question 4

   While ON duty, the allowed measured alcohol concentration is:

   • A.None — any measured concentration or detected presence violates the rule
   • B.Up to 0.02
   • C.Up to 0.04
   • D.Up to 0.08
   Show answer & explanation

   Answer: A. None — any measured concentration or detected presence violates the rule

   On duty, the standard is zero: any measured alcohol concentration or detected presence of alcohol is a violation. (0.04 is where the one-year CDL disqualification begins.)

   Source: 49 CFR Part 392 — Driving of Commercial Motor Vehicles — §392.5(a)(2) — Alcohol prohibition

5. Question 5

   A driver may possess wine, beer, or spirits in the vehicle only when it is:

   • A.Manifested and transported as cargo
   • B.Sealed in the original packaging
   • C.Under one liter total
   • D.Stored in the sleeper berth
   Show answer & explanation

   Answer: A. Manifested and transported as cargo

   Possession on duty is banned — except for alcohol that is manifested cargo being transported.

   Source: 49 CFR Part 392 — Driving of Commercial Motor Vehicles — §392.5(a)(3) — Alcohol possession

30 more Fitness, Fatigue & Compliance questions are in the app, along with explanations and flashcards for every one.

OnRoute is an independent study aid based on the federal CDL standards (49 CFR Part 383), the FMCSA Entry-Level Driver Training theory curriculum (49 CFR Part 380 Appendix A), and related Federal Motor Carrier Safety Regulations. It is not affiliated with, endorsed by, or sponsored by the FMCSA, AAMVA, or any state driver licensing agency. CDL knowledge tests are administered by your state, and state-specific requirements may vary — always consult your state's CDL manual.