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In order to drive tractor-trailers and other large combination vehicles in Missouri, you’ll need to obtain a Class A Commercial Driver’s License (CDL). To earn this license, you must pass the Combination Vehicles Knowledge Test and complete all state and federal requirements, including the CDL General Knowledge Test, before you can take the behind-the-wheel skills exam. You must also complete a medical examination for non-excepted commerce, complete Entry-Level Driver Training (ELDT) with an FMCSA-approved provider, and provide your Social Security card, certified birth certificate, and two proofs of residence before earning your Commercial Learner’s Permit (CLP). After a 14-day holding period, you can take the CDL skills test.
The Missouri Combination Vehicles Knowledge Test includes 20 multiple-choice questions covering safety and operations. You must answer at least 16 questions correctly (80%) to pass. Topics include safe driving practices for tractor-trailers and other combination vehicles, air brake systems specific to combination vehicles, coupling and uncoupling procedures, prevention of skids and jackknives, and vehicle inspection and maintenance procedures. That’s quite a list of tested topics! If you fail, you must wait at least one business day and pay a retesting fee for each additional attempt.
M.S., Chief Educational Researcher (ACES member)
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Our Missouri CDL Combination Practice Tests are designed to help you pass on your first attempt. They mirror the official test format, are based on the latest Missouri CDL Manual, and provide instant feedback and detailed explanations for each response. We also offer multiple practice tests, so once you’ve mastered this one, check out another here: https://driving-tests.org/missouri/mo-cdl-combination-test/.
Missouri’s major roadways, including Interstates 44, 55, 70, and 35, connect key cities like Kansas City, St. Louis, Springfield, and Columbia, making the state a major hub in the Midwest. Top employers hiring Class A CDL drivers in Missouri include Hogan Transportation, Prime Inc., Pepsi Beverages Company, Tyson Foods, UPS, and Wilson Logistics. With constant demand, earning your Class A CDL opens the door to high-paying opportunities across multiple industries.
Because most combination vehicles use air brakes, you’ll also need to pass the Air Brakes Knowledge Test to avoid a restriction on your CDL. Check out one of our Air Brakes Practice Tests here: https://driving-tests.org/missouri/mo-cdl-air-brake-practice-test/. Also, consider preparing for endorsements such as Tanker (N), Hazardous Materials (H), and Doubles/Triples (T), to expand your career options. We have practice tests for many of these as well. Check one out here: https://driving-tests.org/missouri/mo-cdl-hazmat-practice-test/.
Whether you’re hauling agriculture from the Delta, construction materials on I-20, or port freight from Gulfport, earning your Missouri Class A CDL is a great idea!
Driver’s Ed is - nobody wants to set foot inside the DOR. 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 2026 MO 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 DOR.
