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View All PlansIA CDL Combination Vehicles Practice Test 3 2025
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/.
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!
Authored and curated by Steven Litvintchouk, M.S.
Chief Educational Researcher (ACES member)
Methodology & Editorial Policy
Last verified for accuracy: October 2025 (reviewed weekly)
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