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View All PlansFree VT CDL Double/Triple Trailers Practice Test 2025
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Based on 2025 VT commercial driver's license manual
- Triple-checked for accuracy
- Updated for August 2025
Interested in pulling doubles in your commercial driving career? (Triple trailers are not allowed in Vermont.) Good move! Nationwide, drivers pulling multiple trailers were earning up to $25,000 more per year than drivers of single-trailer vehicles as of early 2025. Demand for such drivers has been high. In Vermont, as in many other states, logistics is one sector making heavy use of multi-trailer vehicles. Multi-trailer vehicles can offer more efficient transport, but only a small percentage of truck drivers have the qualifications and training to drive such vehicles. Let’s see what some of those legal qualifications are.
To be legally allowed to pull double trailers in Vermont, you must meet a set of requirements, including passing a series of tests. Because these trucks are a special type of combination vehicle, you must first obtain a Class A Commercial Driver’s License (CDL). To be eligible, you must pass the General Knowledge and Combination knowledge tests. Knowing how to operate air brakes is a practical necessity with heavy multi-trailer vehicles, so you should also pass the Air Brakes knowledge test. Finally, you must pass a skills test in a combination vehicle equipped with air brakes.
To drive double-trailer combination vehicles, you must also obtain a Double/Triple (T) endorsement on your Class A CDL. To get this endorsement, you must pass the Double/Triple knowledge test. This test covers such topics as safe handling, air brakes on doubles and triples, coupling and uncoupling, emergency situations, and state and federal regulations on doubles and triples. (However, no special skills test is required for this endorsement.)
The official Double/Triple knowledge test is based on Chapter 7 (Doubles and Triples) of the official Vermont CDL manual (Vermont CDL Handbook 2025). We offer tools to complement the official manual with intensive training. This Vermont Doubles and Triples Endorsement Practice Test is the first of five such tests we offer. Like the Double/Triple knowledge test, this practice test is based on the official CDL manual. It’s up to date as of August 2025. The 20 multiple-choice questions and answers on this practice test deal with air lines, converter dollies, coupling, emergency situations, following distance, and rearward amplification.
Our AI Assistant can give you a hint if you get stuck on a question or an immediate explanation of the correct answer if you still miss the question. There’s no time limit; take as much time as you want. You can even keep the CDL manual open for reference in another browser tab or separate window. You’ll learn more by looking up the answer to a puzzling question than by random guessing.
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
What to expect on the actual VT DMV exam
questions
correct answers to pass
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Experience the Driving-Tests differenceList of questions (classic view)
- When you're pulling more than one trailer, which trailer should be the first one behind the tractor?
- Which of these statements about quick steering movements and doubles/triples is true?
- You are driving a 100-foot double trailer combination at 50 mph. The road is dry and visibility is good. You should keep at least ____ seconds of space ahead of you.
- Before connecting a converter dolly to a second or third trailer, you should check the height of the trailer. The trailer height is right if
- You are driving a 100-foot double trailer combination at 30 mph. The road is dry and visibility is good. You should keep at least ____ seconds of space ahead of you.
- With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. When you do this, you should hear
- Empty trucks
- Which of these statements about handling doubles and triples is true?
- Before you can supply air to the air tanks of a second trailer, you need to
- You are driving with double trailers and must use your brakes to avoid a crash. For emergency braking, you should
- How can you be sure that you supplied air to a second trailer?
- What is likely to happen if the pintle hook is unlocked while the dolly is still under the second trailer?
- You want to hook your combination to a second trailer that does not have spring brakes. To do this without wheel chocks, you should
- Which of these statements about managing space to the sides is true?
- The crack-the-whip effect that troubles trucks with trailers is most likely to tip over
- You are visually checking the coupling of a converter dolly to the rear trailer. How much space should there be between the upper and lower fifth wheel?
- You are pulling doubles. A set of trailer wheels goes into a skid. Which of the following is most likely to occur?
- You are doing a walk-around inspection of a double or triple trailer rig. You should be sure that the converter dolly air tank drain valves are ______ and the pintle hook is _______.
- A converter dolly is
- A converter dolly consists of a ______ wheel and ________ axles.