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  • Updated for May 2025
  • Based on 2025 OR commercial driver's license manual

Free Oregon CDL Permit Practice Test: General Knowledge 2025

Oregon is a magical place for sightseeing on the open road. The vistas are numerous, including Mount Hood, the Columbia River Gorge, and the coastal views on U.S. Route 101. As a commercial driver, however, you may have to drive with extreme caution through much of Oregon in the wintertime. Western Oregon can be rainy, resulting in slippery roads and lower visibility. Also, the Siskiyou Pass is one of the most dangerous sections of road on Interstate 5. This mountain pass has a 6 percent downgrade for six miles of winding, often foggy, snowy, or icy road with sharp curves.

But let’s not get ahead of ourselves. Before you can legally do any commercial driving, you must have a CDL. And before you can get a CDL, you must first obtain a Commercial Learner’s Permit (CLP) so you can practice commercial driving under the supervision of a CDL holder. One of the most important steps in your obtaining a CLP is to pass the official General Knowledge test on commercial driving theory. And we can help!

The official knowledge test is based on the official Oregon Commercial Driver Manual – but this manual isn’t that easy to study. It’s formatted like a reference work, not like a tutorial or textbook for self-study. That is why you should supplement your reading of the manual with other study tools, such as our practice tests.

Our practice tests are based on the official Oregon Commercial Driver Manual, just like the official knowledge test. And they’re formatted similarly and up to date as of May, 2025. This free Oregon CDL permit practice test you’re about to take has 50 multiple-choice questions on such topics as cargo management, following distance, and vehicle components. Each question comes with a helpful hint and an explanation of the correct answer. Unlike the official test, however, this practice test has no time limit, and you can retake it as often as you wish to help you learn the material. Don’t forget to try our other General Knowledge practice tests too.

Depending on the class of CDL you’ll be applying for and the type of vehicles you expect to be driving commercially, you may have to pass other official knowledge tests as well. Some of these are for endorsements on your CDL, allowing you to drive such specialized vehicles as tank trucks or school buses. Other knowledge tests are for removing restrictions that come with your CDL, such as the restrictions prohibiting you from driving combination vehicles or vehicles with air brakes. We offer practice tests to help you practice to pass all these official knowledge tests too.

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OR 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

4.4 out of 5 • 106 votes
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 OR DMV exam

50

questions

40

correct answers to pass

80%

passing score

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List of questions (classic view)

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