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 | => | 43% |
| 80-89 | => | 30% |
| 70-79 | => | 17% |
| 60-69 | => | 7% |
| <60% | => | 2% |
Did you know that in Colorado you cannot tow more than one trailer or vehicle unless it’s for commercial purposes and you have obtained the Double/Triple Trailers endorsement? If you’re looking to add this endorsement on your Colorado Commercial Driver’s License (CDL), the key requirement is passing a 20-question multiple-choice knowledge test. The test requires a score of 80% (or 16 correct answers) to pass. Once you’ve achieved this certification, you receive a “T” endorsement on your CDL, which authorizes you to pull two or three trailers (where legal) and operate combination vehicles that require this added skill and knowledge (Colorado CDL Handbook 2025).
Chief Educational Researcher, Driving‑Tests.org (ACES member)
Last verified for accuracy on
This endorsement covers double pup trailers, which are legal throughout the United States. Adding this credential significantly enhances your CDL, making you capable of transporting more freight and immediately more marketable in the industry. Goods that are often shipped by way of double trailers in Colorado include agricultural products, industrial goods, consumer goods, and Colorado’s natural resources like coal and timber. You may be saying to yourself, “That sounds incredible! But how can I best prepare for this test?”
There is an abundance of online resources, but too much information can be overwhelming. What you need is a clear and systematic approach, which is where our online Colorado CDL Double/Triple Trailers practice test comes in. It is up to date as of December 2025 and includes 20 multiple-choice questions that resemble what you will face at the DMV on your actual test day!
As you work through our online practice test, you’ll receive instant and detailed feedback on your answers. If you make a mistake, you’ll immediately see the correct answer along with a clear explanation of why it is the better choice. This method reinforces the material in real-time, instead of bombarding you with the entire assessment at the end.
Colorado only requires the passing of this knowledge test in order to add the “T” endorsement to your already existing Class A or Class B CDL. Once you have prepared, passed our free practice tests, and feel ready to go, you simply apply at the DMV, provide the required documentation, and pay the fee prior to taking the official test.
Looking for other Colorado-based CDL endorsements? Find tons of valuable information and practice tests here.
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.
