General Knowledge

Free CDL practice test: 20 questions

Twenty questions, one at a time, like the real test: no hints while you answer. At the end you see your score, whether you would pass and your weakest topics.

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  1. Question 1 of 20 · Vehicle inspectionWhat is the minimum tread depth for the front (steering axle) tires of a truck or bus?
  2. Question 2 of 20 · Basic controlHow should you hold the steering wheel?
  3. Question 3 of 20 · Shifting gearsHow do you know when to shift up?
  4. Question 4 of 20 · Seeing and mirrorsHow far ahead should you look while you drive?
  5. Question 5 of 20 · CommunicatingYou stop on the shoulder of a highway. How soon must you put out your warning devices?
  6. Question 6 of 20 · Managing spaceYour vehicle is 40 feet long and you are driving under 40 mph. What is the minimum following distance?
  7. Question 7 of 20 · Controlling speedTotal stopping distance is made up of which parts?
  8. Question 8 of 20 · Seeing hazardsA vehicle has a sign on the back: an orange triangle with a red border. What does it mean?
  9. Question 9 of 20 · Distracted drivingMay a commercial driver text on a phone while driving a CMV?
  10. Question 10 of 20 · Night, fog, winter and heatIn very hot weather, how often should you check your tires?
  11. Question 11 of 20 · Railroad crossingsWhich vehicles must stop before a railroad crossing even when no train is in sight (unless the crossing is marked exempt)?
  12. Question 12 of 20 · Mountain drivingWhen should you select a low gear for a steep downgrade?
  13. Question 13 of 20 · Emergencies and skidsIn an emergency, why is steering away often better than stopping?
  14. Question 14 of 20 · Crashes and firesYou are in a crash and nobody is badly hurt. What is your first job at the scene?
  15. Question 15 of 20 · Alcohol, drugs and hoursWhat blood alcohol concentration (BAC) means driving under the influence for a CMV driver?
  16. Question 16 of 20 · CargoAfter you start a trip, when must you first check your cargo and its securement?
  17. Question 17 of 20 · Vehicle inspectionHow do you check hydraulic brakes for a leak during the inspection?
  18. Question 18 of 20 · Basic controlYou start a manual-transmission truck on an uphill. How do you keep it from rolling back?
  19. Question 19 of 20 · Shifting gearsWhen is the best time to downshift for a curve?
  20. Question 20 of 20 · Seeing and mirrorsWhen should you check your mirrors more often?

0 of 20 answered

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Questions

Is this the real CDL test?

No, it is not the official test. These are original questions written from the CDL manual and the federal rules (49 CFR), each checked against two sources. The real General Knowledge test usually has about 50 questions (it varies by state) and you need 80 % to pass: 40 of 50.

Why can't I see the answers?

Like on the real test, there are no hints while you answer. At the end you see your score and your weakest topics. A free account shows which ones you missed and the right answer; the explanation of each answer is paid.

Do I need an account?

Not for the free test of the day. The free account needs only your email (no password) and gives you the right answers to your mistakes and 1 more test a day.

Independent practice by Maneja Ya CDL and The Truckers Hub; not affiliated with FMCSA, DOT or any state DMV. The questions are original; none was copied from a manual or another app.