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To operate combination vehicles such as tractor-trailers in Iowa, drivers must pass the Combination Vehicles Knowledge Test, one of several requirements for earning a Class A Commercial Driver’s License (CDL). Without a Class A CDL, you cannot legally drive a combination vehicle whose gross combination weight rating (GCWR) is 26,001 lbs or more and the towed unit’s gross vehicle weight rating (GVWR) exceeds 10,000 lbs. The Hawkeye State provides wonderful opportunities for Class A licensed drivers, and we have exactly what you need to pass this test!
In addition to the Combination Vehicles Knowledge Test, you must complete Entry-Level Driver Training (ELDT) through an FMCSA-approved training provider and pass the CDL General Knowledge Test before scheduling your CDL skills test. Iowa’s ELDT rules align with federal requirements and require completion and verification through the Training Provider Registry (TPR). All of these steps are necessary for the Class A license.
The Iowa Combination Vehicles Knowledge Test includes 20 multiple-choice questions, and you’ll need to answer at least 16 correctly (80%) to pass. If you fail, you must wait one business day and may be required to pay a retesting fee. This is where our suite of practice tests comes in. Our Free Iowa CDL Combination Practice Tests mirror the official exam. They provide instant feedback based on the latest Iowa CDL Manual, allowing you to learn as you go! Topics include safe driving and inspection practices for combination vehicles, coupling and uncoupling procedures, air-brake systems (required for most tractor-trailers), preventing trailer skids and jackknives, and the major parts of combination vehicles. Try out another Combination Vehicle Practice Test here: https://driving-tests.org/iowa/ia-cdl-combination-test/.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
Earning your Class A CDL in Iowa opens the door to high-demand trucking jobs across the state’s major roadways, including I-80, I-35, and I-29. Industries that rely on CDL drivers include agriculture, grain transport, ethanol and biodiesel production, food manufacturing, logistics, and construction. Major Iowa employers hiring Class A drivers include CRST, Fareway, FedEx Freight, Hy-Vee, TMC Transportation, Tyson Foods, UPS, and Walmart Distribution Centers.
Consider also adding endorsements such as Tanker (N), Hazardous Materials (H), or Doubles/Triples (T). Get a taste of our endorsement practice tests by visiting one here: https://driving-tests.org/iowa/ia-cdl-hazmat-practice-test/.
Be sure to also complete the Air Brakes Test, as you’ll need to pass this to remove the air brakes restriction from your CDL. Until you do, your Class A CDL will be severely limited. https://driving-tests.org/iowa/ia-cdl-air-brake-practice-test/.
Our Iowa CDL Practice Tests ensure you pass on your first attempt. Get started now!
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.
