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Driving combination vehicles, such as tractor-trailers, in Idaho requires passing the Combination Vehicles Knowledge Test (in addition to other steps). The knowledge test is one of several requirements for a Class A Commercial Driver’s License (CDL). Without it, you cannot operate vehicles that tow trailers with a gross vehicle weight rating (GVWR) over 10,000 pounds when the total combination exceeds 26,001 pounds (Idaho Commercial Driver’s License Manual).
In addition to the knowledge test, Idaho requires successful completion of Entry-Level Driver Training (ELDT) through a provider listed on the FMCSA Training Provider Registry (TPR). Upon successful completion of the ELDT, a skills test must also be passed (in a representative combination vehicle).
The Idaho Combination Vehicles Knowledge Test consists of 20 multiple-choice questions, at least 16 of which must be answered correctly to pass. If you do not pass, you must wait at least one business day and pay a retesting fee for each subsequent attempt. Of course, with our scientifically designed set of practice tests, you won’t need to worry about that!
M.S., Chief Educational Researcher (ACES member)
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Our Free Idaho CDL Combination Practice Test mimics the real test format using questions based directly on the most recent CDL Manual. The test includes immediate feedback and hints to speed learning and help you retain material and concepts. Topics include safe driving practices specific to combination vehicles (including preventing trailer skids and jackknifes), air brake systems in combination vehicles, proper coupling and uncoupling procedures, and inspection requirements for tractor-trailers.
Earning your Class A CDL in Idaho boosts your marketability in the trucking industry. Major industries requiring this licensure include agriculture and livestock transport, timber and forestry operations, construction and heavy machinery, and long-haul freight and logistics services. Idaho’s major trucking corridors include Interstate 84 (running from Oregon through Idaho to Utah), Interstate 15 (linking southeast Idaho to Montana and Utah), and US Highway 95 (a north-south route through rural regions). Major employers in the region that require combination-qualified drivers include Swift Transportation, Lamb Weston, Challenger Pallet & Supply, and FedEx Freight. With so many organizations dependent on this expertise, you are wise to add this to your licensure!
Most Idaho tractor-trailers have air brakes, so you will want to prepare for the Air Brakes Knowledge Test in addition to the Combination Test. Without this, your CDL will carry a restriction that prohibits you from operating air brake-equipped vehicles. Our specialized Idaho practice tests ensure you’re fully prepared for every exam!
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 2025 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.
