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  • Updated for October 2024
  • Based on 2024 SC commercial driver's license manual

Free South Carolina CDL General Knowledge Test 2024 | SC

Your knowledge of safe commercial driving, covering right-of-way rules, railroad and highway crossings, braking and backing techniques, dealing with special road and weather conditions, and much more, will be tested to help you pass your CDL exam and become a safer driver. Each of the 50 questions has a hint, if you need it, as well as an explanation, which we recommend that you read so that you are able to more efficiently answer any question on the same topic that the real CDL exam might contain. Good luck with this practice exam, take it as many times as necessary to feel comfortable with the topics, and drive safely!

Commercial Driver's License
  • Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
  • Triple-checked for accuracy

What you need to know

Available in EN and ES
Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.
Ensuring the accuracy and quality of our program is paramount. Learn more about our rigorous standards in our Commitment to Accuracy article.

What to expect on the actual SC DMV exam

50

questions

40

correct answers to pass

80%

passing score

List of questions (classic view)

  1. How long does it take a typical tractor-trailer to clear a double railroad track?
  2. The minimum tire tread depth for front tires is
  3. If you double your speed, how much more distance will it take to brake to a stop?
  4. You don't want to be a distracted driver, so you
  5. On which of the following types of fires should you NOT use a B:C fire extinguisher?
  6. In which of the following two situations should you downshift?
  7. Hazardous materials placards are
  8. When you start to drive down a steep downgrade, which of the following should influence your choice of speed?
  9. If the engine is not overheated, is it completely safe to remove the radiator cap?
  10. How often must you stop to check your cargo while on the road?
  11. Which of the following should you NOT do if you experience a tire failure?
  12. Starting the engine and inspecting the cab involves each of the following tasks EXCEPT
  13. You should put the starter switch key into your pocket while you perform the pre-trip inspection because
  14. Why should you cover your cargo?
  15. For how long will you lose your CDL driving privileges if you are convicted of a second DUI offense in either a CMV or your private vehicle?
  16. How can you start moving without rolling backward?
  17. Which of the following is a key steering component?
  18. To transport cargo safely, which of the following are you NOT responsible for?
  19. What can you do at an accident scene to help avoid another accident?
  20. Do empty trucks have the best braking?
  21. Before transporting a sealed load, you must check
  22. While driving at night, which lights should you use as often as you can?
  23. What is the best way to figure out how many seconds of following distance you have?
  24. You should inspect wheel bearing seals for
  25. If you are traveling at 55 mph in a 30-foot vehicle, you should leave how many seconds of following distance?
  26. What will help a drunk sober up?
  27. Always try to back toward the driver's side because
  28. What might happen if you swing wide to the left before you turn right?
  29. Which of the following is NOT something you should check during a trip?
  30. It has just reached freezing. Which of the following areas may be slippery?
  31. What is a common cause of tire fires?
  32. To maintain alertness on your trips, you should
  33. Why is it important to use a helper when backing?
  34. Which is NOT one of the four basic skills that operating a commercial motor vehicle requires?
  35. An antilock braking system (ABS) will
  36. What is the definition of a hazard?
  37. If you are confronted by an aggressive driver, what should you do?
  38. Which of the following statements about retarders are correct?
  39. The most important hand signal that you and a helper should agree on is
  40. Which of these is NOT part of the basic method for shifting up?
  41. Letting the air out of hot tires
  42. Total stopping distance equals
  43. Which of the following are governed by Jacob's Law?
  44. What is the gross vehicle weight (GVW)?
  45. How can you determine if your vehicle is equipped with an antilock braking system (ABS)?
  46. During your pre-trip test, when examining hoses with the instructor, you need to look for
  47. Where should you place your warning devices if you must stop on a one-way road or divided highway?
  48. On wet roads, you should reduce your speed by
  49. To help you stay alert and safe while driving, you should
  50. How many tie-downs are required for a 20-foot load?
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