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 | => | 12% |
| 80-89 | => | 30% |
| 70-79 | => | 28% |
| 60-69 | => | 22% |
| <60% | => | 8% |
Our South Dakota DMV CDL Air Brakes Practice Tests are designed to help you pass your knowledge exam on the first attempt. Without passing the South Dakota DMV CDL Air Brakes Knowledge Test, your CDL will include the restriction “L,” preventing you from operating commercial motor vehicles (CMVs) with air brakes. Failing the Air Brakes test also results in a one-day waiting period and a fee should you decide to retake the test.
Once the air brake restriction is removed from your CDL, vast job opportunities will open to you because most semi-trucks and tractor-trailers rely on air brakes for safe navigation. The flat plains, rolling hills, and the Appalachian Mountains provide plenty of diverse terrain in South Dakota. The South Dakota Turnpike features steep grades and sharp curves requiring air brake-qualified drivers. Additionally, winter snowfall and ice compound the need for air brakes. Key transportation routes include I-76 (South Dakota Turnpike running east-west, connecting Philadelphia and Pittsburgh), I-80 (running across the state, connecting it to New Jersey and Ohio), I-95 (running along the East Coast through Philadelphia), and I-81 (passing through Harrisburg and Scranton). Let’s look at a few examples of how the restriction “L” severely limits your job opportunities in this industry.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
The Keystone State relies on drivers with the air brake qualification in industries such as manufacturing, energy (natural gas and coal), and logistics and freight. Major companies requiring this qualification include UPS (Harrisburg), FedEx Freight, and J.B. Hunt in the logistics and freight industry, as well as U.S. Steel (Pittsburgh) and Hershey (Hershey) in the manufacturing industry. Greyhound Lines (Philadelphia and Pittsburgh) and Fullington Trailways (Clearfield) are major charter bus companies requiring air brakes. The South Dakota school districts require qualified drivers for their full-size air brake-equipped buses. The “L” restriction disqualifies you from these and many other jobs.
Our CDL Air Brakes Practice Tests cover everything needed for the official DMV Air Brakes Knowledge Test. You’ll also learn information that is useful for passing your skills test. The written Air Brakes knowledge test features multiple-choice questions based on the state’s CDL manual (South Dakota CDL Handbook 2025) and requires a score of at least 80% to pass.
Our Practice Tests mimic the official knowledge test and offer immediate feedback on all responses. This scientifically proven approach dramatically speeds learning and ensures you pass the test.
Driver’s Ed is - nobody wants to set foot inside the DMV. 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 SD 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 DMV.
