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Are you studying to pass the official Idaho Combination Vehicles knowledge test (which is a a necessary step to drive semi-trucks and tractor-trailers)? Worried that you may not pass without some additional help? We’re glad you chose us to help you, because we’re sure you won’t be disappointed. Many other aspiring truck drivers couldn’t quite master commercial driving theory just by reading the official Idaho Commercial Driver’s License Manual (Idaho CDL Handbook 2026). That’s why many of them chose to supplement their reading of this study guide with other study tools – such as the ones we offer.
This free Idaho CDL Combination practice test is based on the official manual, just like the official Combination Vehicles knowledge test. And the practice test is up to date as of January, 2026. Practicing with it will help reinforce what you read in the CDL manual. In addition, each of the 25 practice questions comes with a helpful hint and an explanation of the correct answer. The practice questions and answers on this test will assess your knowledge of such topics as combination braking systems, combination driving techniques, coupling and uncoupling, and pre-trip inspections. Keep practicing your knowledge with as many of our practice tests as you can, as often as you can, until you feel confident that you’ve mastered the material and can ace the official Combination Vehicles knowledge test.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
Once you pass this knowledge test and get the appropriate class of Commercial Driver’s License (CDL) and any endorsements you need, you can start taking advantage of profitable opportunities in combination truck driving. Idaho produces huge quantities of agricultural products: most famously potatoes, but also wheat, barley, and dairy products, all of which require truck drivers to transport. Folks who don’t live in Idaho may think of it as just an agricultural state, but the state also has a large and growing industrial sector, especially in science and technology. High-tech businesses require truck drivers to transport equipment and supplies to them as well as transport their finished products. Other important economic sectors include logging (lumber and wood products) and silver and other mining. These types of businesses also need truckers to transport these raw materials.
Major trucking routes include Interstates 15 (Montana to California), 84 (Oregon to Utah), and 90 (Washington State to Massachusetts); U.S. Routes 20 (Oregon to Massachusetts) and 95 (Idaho to Arizona); and State Route 55 (connects with U.S. 95 at both ends).
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 2026 ID 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.
