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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.
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View All Plans| 90-100 | => | 42% |
| 80-89 | => | 25% |
| 70-79 | => | 18% |
| 60-69 | => | 9% |
| <60% | => | 5% |
If you’re in the market for a California CDL Double/Triple Trailers Endorsement, you may already know that in California you cannot tow more than one trailer or vehicle unless it’s for commercial purposes and you have this endorsement. The key requirement for achieving this is passing a 20-question multiple-choice knowledge test. The test requires a score of 80% (or 16 correct answers) to pass. Once you secure this certification, you receive a “T” endorsement on your Commercial Driver’s License (CDL), which authorizes you to pull two or three trailers (where such laws allow) and operate combination vehicles that require this added skill and knowledge (California CDL Handbook 2025). (Currently, California does not allow triple trailers.)
In California, drivers with a Double/Triple Trailers endorsement commonly haul freight and parcels from companies like UPS and FedEx, as well as retail goods, agricultural products, building materials, and more. This endorsement adds a significant amount of marketability to your transport credentials! You may be saying to yourself, “That sounds great! But how can I best prepare for this test?”
You will find no shortage of online resources but too much information can be overwhelming. What you need is a systematic and focused approach. That’s where our online 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 take our free online California CDL Double/Triple Trailers practice test, you will receive immediate and detailed feedback on your answers. If you get a question wrong, you are immediately shown exactly why a different response is better. This helps solidify the content in your mind as you progress through the practice session, instead of bombarding you with the entire assessment at the end.
The good news is that the state of California 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 required fee prior to taking the official test.
Looking for other California-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 CA 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.
