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

Free Idaho CDL Permit Practice Test: General Knowledge 2025

Are you studying to pass the official Idaho General Knowledge test so you can become eligible for a Commercial Learner’s Permit (CLP)? Worried that you may not pass without some additional help? We’re glad you chose us to help you, because we’re sure you won’t be disappointed. You’re not the only one who hasn’t mastered commercial driving theory by just reading the official Idaho Commercial Driver’s License Manual (Idaho CDL Handbook 2025). That’s why many other aspiring commercial drivers have decided to supplement their reading of the manual with other study tools.

This free Idaho CDL permit practice test is based on the official manual, just like the official General Knowledge test. And the practice test is up to date as of January, 2025. Practicing with it will help reinforce what you read in the manual. In addition, each of the 50 practice questions comes with a helpful hint and an explanation of the correct answer. The practice questions on this test will assess your knowledge of such topics as basic maneuvers, cargo management, emergency preparedness, and pre-trip inspections. Keep practicing your knowledge with as many of our practice tests as you can, as often as you can, until you feel confident that you’ve mastered the material and can ace the official General Knowledge test.

There’s one other major test you must take for a CLP: a medical examination. Once you pass those tests and meet some other requirements, you can obtain a CLP and start practicing commercial driving so you can pass the skills test for your Commercial Driver’s License (CDL). The skills test consists of three parts: basic vehicle maneuvers (such as backing), a pre-trip inspection of the vehicle, and a road test.

Once you get your CDL, you can start taking advantage of profitable opportunities in commercial driving. Idaho produces huge quantities of agricultural products, most famously potatoes, but also wheat, barley, and dairy products, all of which require truck drivers to transport. Folks who don’t live in Idaho may think of it as an agricultural state, but the state also has a large and growing industrial sector, especially in science and technology. High-tech businesses also require truck drivers to transport equipment and supplies to them as well as transport their finished products.

Another important economic sector is tourism. Idaho attracts visitors all year round to its national parks, ski resorts, and other tourist and recreational areas, creating a constant demand for bus drivers.

Major commercial routes include Interstates 84 and 90, U.S. Route 95, and State Highway 55.

[faq]

FAQs

How can you get yours?

To obtain a CDL license in Idaho, start by getting a commercial learner’s permit (CLP) after passing the required knowledge tests. Hold the CLP for at least 14 days before taking the skills test. Completing CDL training is recommended and then pass the skills test. Ensure you meet all medical and legal requirements.

What is the associated cost?

The cost for a CDL in Idaho includes a $40 application fee, a $29 fee for the knowledge test, and a $70 fee for the skills test. Additional costs may apply for endorsements and training programs.

What can disqualify you from being eligible?

In Idaho, disqualifications from obtaining a CDL include major traffic violations such as DUIs, reckless driving, certain criminal convictions, and failing the medical examination required for CDL holders.

How long does training last?

CDL training duration in Idaho varies by program. Full-time training can last from a few weeks to several months, depending on the school and the specific program.

[/faq]

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 ID DMV exam

50

questions

40

correct answers to pass

80%

passing score

List of questions (classic view)

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