All your missed questions are saved
automatically for extra practice.
It's a practice test that's automatically made up of all your missed questions. Once you finish this test, you’ll be able to revisit your Challenge Bank™ to practice and sharpen your skills.
View All PlansAdding difficult questions to Challenge Bank™ is an exclusive Premium feature. Unlock access to 650+ exam-like questions, a Pass Guarantee, personalized study plans, and more.
View All Plans| 90-100 | => | 0% |
| 80-89 | => | 67% |
| 70-79 | => | 0% |
| 60-69 | => | 33% |
| <60% | => | 0% |
In Colorado, the Department of Revenue (DMV) publishes the official Colorado Commercial Driver License Manual (Colorado CDL Handbook 2025). Every aspiring commercial driver should read this manual multiple times during their learning phase, as it includes essential information vital to a successful career in this field. The manual also helps you prepare for the theory and skills exams, which are part of the licensing process.
Since most combination vehicles in Colorado have air brakes, it is crucial to learn how they work. To drive commercial vehicles equipped with air brakes legally, you must pass the official air brakes knowledge exam and a skills test in a vehicle with air brakes. If you don’t, your CDL will have an L restriction, and you won’t be allowed to drive vehicles with air brakes.
Our Colorado CDL Combination Vehicles Practice Test, when used regularly, can significantly boost your learning potential. It is preferred by students who seek a better alternative to the official commercial driver license manual. This intuitive tool consists of 25 multiple-choice questions and includes several features. Unlike the official combination vehicles knowledge exam, this practice test is not timed. You have the flexibility to study when and how it suits you best.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
All you need is a compatible device, a stable internet connection, and several hours of your time. “Officer Frank,” our automated assistant, will be present during your training sessions. This AI coach can explain the most complex topics in a way everyone can understand. Additionally, “Officer Frank” can give personalized answers to your individual questions, hints, and real-life examples. Learn from your mistakes as soon as they occur with the help of the detailed explanation provided for each question. Please pay attention to this feedback and note it in a notebook or notebook app.
Because this practice test can be used for educational purposes, you can master commercial driving theory while also preparing for the official combination vehicles exam. Begin your training today and dedicate several weeks to your learning phase. During this time, you can also use our Free Colorado CDL Permit Practice Test to reinforce your knowledge.
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.
