All your missed questions are saved
automatically for extra practice.
It's a practice test that's automatically made up of all your missed questions. Once you finish this test, you’ll be able to revisit your Challenge Bank™ to practice and sharpen your skills.
View All PlansAdding difficult questions to Challenge Bank™ is an exclusive Premium feature. Unlock access to 650+ exam-like questions, a Pass Guarantee, personalized study plans, and more.
View All Plans| 90-100 | => | 29% |
| 80-89 | => | 57% |
| 70-79 | => | 14% |
| 60-69 | => | 0% |
| <60% | => | 0% |
An “L” restriction on your North Dakota Commercial Driver’s License (CDL) prohibits you from operating vehicles equipped with air brakes. Your success as a commercial driver is greatly affected by having an “L” restriction on your CDL. Potential employers, such as F & M Transport and Bis-Man Transit, are more likely to pass on hiring drivers who are not air-brake qualified. Air brakes are a vital safety feature that allows you to regulate your speed. More braking force is required for vehicles transporting heavily weighted loads to slow down or come to a complete stop. Adverse weather, sharp turns, and heavily congested traffic require you to adjust your speed, and a firm grasp of air brake operation will help you safely navigate such rapidly changing driving conditions.
Our North Dakota DOT CDL air brake “endorsement” practice test expedites the learning process. The practice test targets the learning obstacles keeping you from successfully passing a skills test in a vehicle equipped with air brakes (including conducting an inspection of the air brakes) and an official Air Brakes knowledge test. These are the steps to remove your “L” restriction, and you must correctly answer at least 80% of the 25 questions on the official knowledge test to pass.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
This North Dakota DOT air brake “endorsement” practice test enhances your knowledge of air brake operations to help you meet the challenges of the official knowledge test. The practice test uses 30 questions, like those on the official knowledge test, to assess your proficiency and direct you to the information you should study more. You can rely on the practice test to help you create a plan that advances your learning.
Using the most authoritative information available, the practice test fills your knowledge gaps to exhibit an extensive knowledge of air brake operations. The practice test is based on the most recent North Dakota DOT CDL manual (North Dakota CDL Handbook 2025) and is up to date as of December 2025. If you get a question wrong, the practice test will use information directly from the CDL manual to explain the correct answer and show you how to apply it to your driving practices.
More traditional study methods take a much different approach to learning, which is one-dimensional and makes learning a complex activity. Traditional study methods train you to memorize the answers to the questions without providing information to correct your misconceptions. The practice test makes this information readily available, boosts your confidence, and increases your chances of passing the official knowledge test on your first attempt.
Less confident drivers may be intimidated by traveling around the Roughrider State, but you’ll have a smooth ride with the driving skills developed with the practice tests at https://driving-tests.org/north-dakota/.
Driver’s Ed is - nobody wants to set foot inside the DOT. That’s why millions of learners trust us for simple, visual, effective prep.
We are an officially recognized FMCSA Entry-Level Driver Training provider and a proud partner to over 2,500 libraries. We work with safety organizations like GHSA and the National Safety Council to help create safer roads for everyone.
Our trademarked system automatically saves questions you miss, creating personalized tests that target your weak spots until you’ve mastered the material.
Get smarter as you study. Our new AI-powered feedback provides detailed, question-level insights to help you understand the why behind each answer.
Go beyond the boring black-and-white manual. Our interactive handbook lets you read, listen with an MP3 audio version, or even chat with it to find the information you need, faster.
We build our practice questions from the current 2025 ND Driver Handbook and refine them using patterns recent test‑takers report.
Driver handbook • Knowledge‑test/permit overview • Fees & ID requirements • Office/appointment info
We mirror recurring themes (e.g., right‑of‑way traps, sign look‑alikes) and use similar distractors and wording styles.
We don’t collect or publish actual test items and we’re not affiliated with DOT.
