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View All PlansPassing the CDL Combination Vehicles Knowledge Test is required to earn a Class A Commercial Driver’s License (CDL) and legally drive combination vehicles in Iowa. Other requirements include passing a skills test in a combination vehicle and Entry-Level Driver Training (ELDT) through an FMCSA-approved provider.
The state’s Combination Vehicles Knowledge Test consists of 20 multiple-choice questions, and you must score at least 80% to pass. If you fail the exam, you must wait at least one business day and may have to pay a retest fee. Our Free Iowa CDL Combination Practice Tests help eliminate that possibility with their scientifically proven design that helps you pass on your first attempt.
Based on the most recent Iowa CDL Manual, our practice test provides immediate feedback and hints and mimics the format and content you’ll face on the real exam. Topics include safe driving practices for combination vehicles, braking systems (especially air brakes) in combination vehicles, proper coupling and uncoupling procedures, inspection procedures, and the major parts of combination vehicles.
M.S., Chief Educational Researcher (ACES member)
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Earning your Class A CDL increases your marketability for Iowa’s jobs. Major trucking corridors include I-80 (connecting Davenport, Iowa City, Des Moines, and Council Bluffs), I-35 (running north-south through Des Moines), and I-29 (running along western Iowa). Major industries that depend on Class A CDL drivers include agriculture, food production, manufacturing, ethanol and biodiesel, grain transport, logistics, and construction. Employers include Tyson Foods, Fareway, Hy-Vee, FedEx Freight, UPS, CRST, TMC Transportation, and Walmart Distribution centers. With such a wide variety of industries and businesses operating in Iowa, securing your Class A license is a powerful step toward expanding your career opportunities.
Other endorsements to consider include Tanker (N), Hazardous Materials (H), and Doubles/Triples (T). Having these certifications adds substantial credibility (and marketability) to your license. You should also prepare for and take the Air Brakes Test if you haven’t already, since most tractor-trailers, semi-trucks, and combination vehicles use air brake systems. We provide an entire suite of Practice Tests specifically designed to help you learn the material for each of these and pass their respective exams on your first attempt.
Be sure to check out all our available Iowa-specific practice tests to fully prepare and pass with confidence!
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 2026 IA 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.
