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

    Free Missouri CDL Permit Practice Test: General Knowledge 2025

    For commercial driving in the great state of Missouri, major routes include Interstate 44, which begins at Wichita Falls, Texas and connects St. Louis to Springfield, where it terminates; and Interstate 70, which begins at Cove Fort, Utah, connects St. Louis to Kansas City, and finally terminates near Baltimore, Maryland. However, heavy truck congestion and frequent construction or work zones along much of I-70’s length can make driving difficult. U.S. Route 63 starts near Ashland, Wisconsin, connects Columbia and Jefferson City to northern Arkansas, and eventually terminates at Ruston, Louisiana. U.S. Route 60 begins at Brenda, Arizona, proceeds through southern Missouri, and afterward terminates at Virginia Beach, Virginia. Missouri Route 13 links Kansas City with Springfield and passes through the Ozark Plateau. However, as you drive through the Ozarks on some of these roads, you are likely to encounter steep grades and narrow, winding roadways, through which you’ll have to proceed with caution, especially in poor weather.

    For you, though, commercial driving on these roads is probably still a bit in the future. It’s likely that you’re here because you want to pass the official knowledge test for a Commercial Learner’s Permit (CLP), a vital credential along the way to obtaining a Commercial Driver’s License (CDL). And because you feel you need a little more help than what you’ve gotten from the official Missouri Commercial Driver License Manual (Missouri CDL Handbook 2025). OK. Let’s do this!

    This free Missouri CDL permit practice test, which you’re about to take, 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 braking, driving on downgrades, following distance, and vehicle components. Unlike the official knowledge test, each question on this practice test comes with an available hint; use it if you get stuck. Each question also comes with an explanation of the correct answer. Read it carefully if you missed the question so you won’t make the same mistake again next time. 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 you proceed further with the test.

    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 MO DOR exam

    50

    questions

    40

    correct answers to pass

    80%

    passing score

    List of questions (classic view)

    1. Letting the air out of hot tires
    2. How many tie-downs are required for a 20-foot load?
    3. How many reflective warning triangles must you carry with you for emergencies?
    4. If you are being tailgated, you should NOT
    5. Which of the following should you check during your trip?
    6. What is the penalty for driving a commercial motor vehicle (CMV) without a CDL?
    7. If your brakes get wet, they may
    8. To maintain alertness during your trip, you should
    9. If you are traveling at 55 mph in a 30-foot vehicle, you should leave how many seconds of following distance?
    10. When backing, it is important to use a helper
    11. Which of the following are safe ways to communicate with others?
    12. If the engine is not overheated, is it completely safe to remove the radiator cap?
    13. For how long will you lose your CDL privileges if you are convicted of a second DUI offense?
    14. The minimum tread depth for tires other than the front tires is
    15. Which of the following are most likely to get stuck at a raised railroad crossing?
    16. If you are confronted by an aggressive driver, you should
    17. In which of the following two situations should you downshift?
    18. The most important hand signal you should agree on with a helper is
    19. If you double your speed, how much more distance will it take to stop?
    20. What might happen if you swing wide to the left before you turn right?
    21. How can you determine if your vehicle is equipped with an anti-lock braking system (ABS)?
    22. Which of these is NOT part of the basic method for shifting up?
    23. What is the best way to check what is happening behind and to the sides of your vehicle?
    24. You should inspect wheel bearing seals for
    25. How long does it take a typical tractor-trailer to clear a double railroad track?
    26. On which of the following types of fires should you NOT use a B:C fire extinguisher?
    27. Which of the following is NOT a key steering component?
    28. What is the main reason to perform a vehicle inspection?
    29. How can you start moving without rolling backward?
    30. An anti-lock braking system (ABS) will
    31. Do empty trucks have the best braking?
    32. What is a common cause of tire fires?
    33. What is the best way to figure out how many seconds of following distance you have?
    34. If you're driving a vehicle with an automatic transmission, when should you downshift?
    35. Try to back toward the driver's side because
    36. What are the main differences between aggressive driving and road rage?
    37. Where should you place your warning devices if you must stop on a one-way road or divided highway?
    38. You don't want to be a distracted driver, so you
    39. Which of the following are serious traffic violations that may cause you to lose your CDL privileges?
    40. Which of the following statements about retarders are correct?
    41. What is the first step of proper braking technique when you're going down a steep downgrade?
    42. What is the definition of a hazard?
    43. Total stopping distance equals
    44. How do you test a vehicle's hydraulic brakes for leaks?
    45. What will help a drunk sober up?
    46. You should put the starter switch key into your pocket while you perform the pre-trip inspection because
    47. When you start down a steep downgrade, which of the following should influence your choice of speed?
    48. If you feel drowsy while driving, what should you do?
    49. It has just reached freezing. Which of the following areas may be slippery?
    50. Which of the following are parts of the suspension system?
    Are you in another state?

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