- Updated for March 2025
- Based on 2025 HI commercial driver's license manual
Free HI CDL Double/Triple Trailers Practice Test 2025
In Hawaii, the use of double trailers is effectively restricted, and triple trailers are not allowed at all. A typical “pup” trailer is about 28 feet long, so two of them have a combined length of 56 feet (not counting the connecting dolly). In HI, however, the maximum allowed length of the semi-trailer part of a truck is just 48 feet unless an oversize permit is obtained. For this reason, if you want to pull doubles (or even triples) in your trucking career, you may find more employment or economic opportunities outside the state.
To drive combination vehicles, you must obtain a Class A CDL. First, you must pass the General Knowledge Test on general commercial driving theory and a skills test to obtain any class of CDL. To get a Class A CDL in particular, you must also pass the Combination Vehicles knowledge test on the theory of operating combination vehicles and pass the skills test in such a vehicle. Under federal regulations, to drive combination vehicles with two or even three trailers or semi-trailers, you must also obtain a Double/Triple (T) endorsement on your Class A CDL. (However, triple trailers are prohibited in Hawaii.) To obtain this endorsement, you must pass the Double/Triple knowledge test. (No skills test is required for this endorsement.)
All these knowledge tests are based on the official Hawaii CDL manual (Hawaii CDL Handbook 2025). You likely studied parts of this manual to get your CDL. All questions on the Double/Triple knowledge test are based on Chapter 7: Doubles and Triples.
We have created a set of study tools to help aspiring drivers like you pass their knowledge exams on their first try. This Hawaii Doubles and Triples Endorsement Practice Test, one of five we offer, supplements the official manual with intensive practice. It’s based on Chapter 7 of the official CDL manual, just like the official Double/Triple knowledge test. It’s up to date as of March 2025. The 20 multiple-choice practice questions and answers on this practice test deal with such topics as air lines, converter dollies, coupling, following distance, rearward amplification, and rollovers.
Our AI Assistant can help you figure out the answer to any practice question. You can ask it to give you a hint or rephrase the question. You can also ask your own questions. If you still miss the question, the AI Assistant will immediately give you the correct answer and an accompanying explanation. You won’t have to wait till the end of the test to learn why your answer was incorrect.
- 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 HI DMV exam
questions
correct answers to pass
passing score
List 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.
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