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Welcome! You’re probably here because you want to pass the official Combination Vehicles knowledge test on the theory of operating combination vehicles, which you must do to be allowed to drive semi-trucks and tractor-trailers. We hope you’ve been reading the official Colorado Commercial Driver License Manual (Colorado CDL Handbook 2025), especially Section 6 (Combination Vehicles), because the official knowledge test is based on it. But are you also looking for some additional help to improve your chances of passing the test?
Well, that’s what we’re here for! We’ve helped thousands of aspiring car drivers and commercial drivers pass their respective knowledge exams, and we’re going to help you too.
Chief Educational Researcher, Driving‑Tests.org (ACES member)
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This free Colorado CDL Combination practice test, one of several we offer, is based on the above official study guide, just like the official Combination Vehicles knowledge test. The practice test is up to date as of December, 2025. As you practice answering questions about the stuff you’ve been reading in the manual, that material will become easier to remember, increasing your chances of passing the official exam. To make your learning easier, 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 safe driving techniques, combination braking systems, coupling and uncoupling, and pre-trip inspections. If you need help to answer a question, our automated assistant can give you a hint. If you still miss the question, the assistant can provide you with an explanation of the correct answer.
Once you obtain a Commercial Learner’s Permit (CLP), you can start practicing commercial driving of combination vehicles until you get good enough to pass the official skills test. Passing the skills test in a combination vehicle is a necessary step toward obtaining a Class A Commercial Driver’s License (CDL).
Once you hold a Class A CDL, you can start earning real money as a licensed driver of combination vehicles. Economic sectors in Colorado’s diversified economy include agriculture (hay, corn, wheat, and beef), aerospace, manufacturing, and gold mining and production. All these sectors need truck drivers to transport their products. The aerospace and mining industries also need truck drivers to deliver equipment and supplies to them.
You’ll soon become familiar with Colorado’s major truck routes. Here are some. Interstate 25, heavily used by truckers, runs from Wyoming through Denver and then to New Mexico. Interstate 70 runs from Utah to Maryland. Interstate 76 and U.S. Route 285 are heavily used by truckers to transport agricultural products.
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 CO 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.
