Idaho General Knowledge CDL Prep Test (ID) 4

4.9 out of 5 (54 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Get ready to enhance your driving skills with our Idaho General Knowledge CDL Practice Test. This fourth DMV practice test in our series is specifically designed to ensure that you're well-equipped with the essential knowledge needed for safe and efficient driving. Our practice test features 20 carefully crafted questions, mirroring the format and style of the actual CDL examination in 2026. You'll need to correctly answer at least 16 questions to pass, but don't worry, every attempt helps you get closer to that goal. What sets our Idaho CDL practice test apart is the detailed feedback you receive at the end of each session. You'll see not just your score, but also a breakdown of any questions you missed, complete with correct answers. This feedback is an invaluable tool, helping you learn from your mistakes and solidify your understanding of key concepts. The questions in our general knowledge practice test cover a range of vital topics. From the intricacies of pre-trip inspections to the nuances of sharing the road, basic vehicle control, transporting cargo safely, and handling emergency situations - we've got it all covered. This thorough approach ensures that you're not just prepared to pass the Idaho CDL written test in 2026, but also to handle the real-world challenges of professional driving. We understand that everyone's learning style is different. That's why our Idaho CDL general knowledge practice tests are customizable. You can focus on areas where you need the most practice, retake the DMV test as many times as you like, and study at your own pace. Whether it's early morning or late at night, our tests are accessible whenever you are ready to learn. With these tools at your disposal, you're not just practicing for a test; you're building the foundation for a successful and safe driving career. So, Idahoans, gear up and get set to ace that CDL written knowledge test in 2026!
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Sample Idaho CDL Test Questions - General Knowledge

Question 1

When cargo inspection is feasible, when must the driver recheck the load and its securement during a trip?

  1. A Within 25 miles, then every two hours or 100 miles
  2. B Within 50 miles, then only at the end of the driving day
  3. C Within 50 miles, after a duty-status change, and after three hours or 150 miles, whichever occurs first
  4. D Only before departure and after reaching the destination

Correct answer: C – Within 50 miles, after a duty-status change, and after three hours or 150 miles, whichever occurs first

Federal regulation requires the first cargo and securement reinspection within the first 50 miles. Additional inspections are required when the driver changes duty status and after three hours of driving or 150 miles, whichever occurs first. The Idaho CDL manual presents the same basic intervals. Exceptions apply when cargo is sealed or loaded so that inspection is impracticable.

Source: Idaho Commercial Driver’s License Manual — § 3.1.2, “Inspecting Cargo”, 49 CFR § 392.9(b)(2)–(4) — Inspection of Cargo, Cargo Securement Devices and Systems

Question 2

Blocking can be used to prevent cargo from sliding on the cargo deck.

  1. A True
  2. B False

Correct answer: A – True

True. The Idaho CDL manual describes blocking as material placed at the front, rear, or sides of cargo to keep it from sliding. Effective blocking fits snugly against the cargo and is secured to the cargo deck. Bracing is a related method that supports cargo from its upper portion to the floor or walls.

Source: Idaho Commercial Driver’s License Manual — § 3.3.1, “Blocking and Bracing”

Question 3

During Idaho's CDL basic control skills test, what is a pull-up?

  1. A Moving forward during a backing exercise to improve the vehicle's position
  2. B Completing the exercise by driving forward instead of backing
  3. C Stopping briefly without changing direction
  4. D Leaving the cab to check the vehicle's position

Correct answer: A – Moving forward during a backing exercise to improve the vehicle's position

A pull-up occurs when the driver moves forward during a backing exercise to clear an encroachment or obtain a better position. Merely stopping without changing direction does not count. Initial pull-ups are permitted, although an excessive number may be scored as errors during the basic control skills test.

Source: Idaho Commercial Driver’s License Manual — § 12.1, “Scoring”

Question 4

During a dual air-system buildup test, pressure should rise from 85 psi to what level within 45 seconds?

  1. A 100 psi
  2. B 60 psi
  3. C 80 psi
  4. D 120 psi

Correct answer: A – 100 psi

With the engine operating at the proper speed, a dual air system should normally build from 85 to 100 psi within 45 seconds. Vehicles with larger-than-minimum air tanks may require more time and still be safe, so the manufacturer's specifications must also be checked. A system that builds pressure too slowly must be repaired before driving.

Source: Idaho Commercial Driver’s License Manual — § 5.3, “Check Rate of Air Pressure Buildup”

Question 5

Even if someone else loads the vehicle, which cargo-related duties remain the driver's responsibility?

  1. A Inspecting the load and identifying overloads or poor weight balance
  2. B Confirming the cargo is secured and does not block the driver's view
  3. C Confirming the load does not block access to emergency equipment
  4. D All of the above

Correct answer: D – All of the above

The driver remains responsible for inspecting the cargo, recognizing overloads or poor weight distribution, and knowing that the load is properly secured. Cargo must not obscure the driver's forward or side view or block access to emergency equipment. Federal rules also prohibit operating a commercial vehicle when its cargo interferes with safe operation or necessary emergency access.

Source: Idaho Commercial Driver’s License Manual — § 3.1, “Inspecting Cargo”, 49 CFR § 392.9(a) — Inspection of Cargo, Cargo Securement Devices and Systems

Question 6

What type of information is normally displayed on a brown highway sign?

  1. A Recreational or cultural-interest guidance
  2. B General traffic warnings
  3. C Traffic laws and restrictions
  4. D Temporary work-zone instructions

Correct answer: A – Recreational or cultural-interest guidance

Brown signs provide guidance to recreational and cultural-interest destinations. On Idaho roads, they may identify parks, historic sites, trails, campgrounds, or similar attractions. Regulatory signs and general warning signs use other established color patterns, while temporary traffic-control signs are normally orange.

Source: Manual on Uniform Traffic Control Devices for Streets and Highways, 11th ed., Revision 1 — § 1D.05, “Color Code”

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