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  • Updated for January 2025
  • Based on 2025 LA commercial driver's license manual

Free Louisiana CDL Permit Practice Test: General Knowledge 2025

For commercial driving in the great state of Louisiana, major routes include Interstate 10, U.S. Route 90, and U.S. Route 61. Interstate 10 is America’s southernmost transcontinental freeway. It runs from Los Angeles, California to Jacksonville, Florida, passing through Baton Rouge and New Orleans. Unfortunately, it is often heavily congested around Baton Rouge. U.S. Route 90 starts at Van Horn, Texas, runs near I-10, connects Lafayette to New Orleans, and terminates at Jacksonville, Florida. It serves as an alternative to the heavily congested I-10, especially for trucks carrying cargo to the oilfields or refineries along the Gulf Coast. U.S. Route 61 starts at the city of Wyoming, Minnesota and runs southward to Baton Rouge and New Orleans, generally following the course of the Mississippi River.

Before you can legally drive on these or any other roads as a commercial driver, however, you’ll need to obtain a Commercial Driver’s License (CDL). That’s likely why you’re here. You know that you must obtain a Commercial Learner’s Permit (CLP) to practice commercial driving before you can obtain a CDL. And you know that a necessary step to obtaining a CLP is to pass the official knowledge test on commercial driving theory. But you’re concerned that you may not pass that knowledge test just by reading the official Louisiana Commercial Driver License Manual (Louisiana CDL Handbook 2025). Don’t worry. We have some other tools for you that will help you ace that knowledge test!

This free Louisiana CDL permit practice test is based on the official state manual, just like the official knowledge test. It’s up to date as of January, 2025. And it’s formatted like the official test, too. There are 50 multiple-choice questions on such topics as emergency preparedness, pre-trip inspections, and safe driving techniques. Unlike the official knowledge test, however, our automated assistant can help you by providing you a hint for each question and an explanation of the correct answer. Read the explanation carefully if you missed the question so you won’t make the same mistake again. What this practice test doesn’t have is a time limit. Take your time, not only to improve your chances of passing the test but also to learn as much as you can from the experience. For example, if you miss a question, you may want to pause and look up the information in the CDL manual before proceeding further with the test.

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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.
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What to expect on the actual LA OMV exam

50

questions

40

correct answers to pass

80%

passing score

List of questions (classic view)

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