- Updated for March 2025
- Based on 2025 ID commercial driver's license manual
Free ID CDL Double/Triple Trailers Practice Test 2025
If you’re an Idaho resident and want to drive combination vehicles with two or even three trailers or semi-trailers, you’re in luck. Idaho is a double- and triple-friendly state. Double pup trailers are legal nationwide, ID included. However, Idaho also allows the following types of Long Combination Vehicles on some of its major roads: Rocky Mountain Doubles (a standard-size trailer followed by a pup trailer), Turnpike Doubles (two full-length trailers), B-Trains (two full-length semi-trailers), and even Triples (three pup trailers). LCV drivers are in high demand because few drivers have the necessary endorsements or training to operate such vehicles.
If you want to drive LCVs, start by obtaining a Class A CDL (including passing the General Knowledge and Combination knowledge tests). Obtaining the Air Brakes qualification is a practical necessity. For this qualification, you must pass the Air Brakes knowledge test and a skills test in a Class A combination vehicle with air brakes. Then pass the Double/Triple knowledge test to obtain a Double/Triple (T) endorsement on your Class A CDL. (Note that no special skills test is required for this endorsement.)
Idaho also requires you to undergo specialized training to operate LCVs. Once completed, you’ll receive an LCV Driver Training Certificate.
The official Double/Triple knowledge test covers such topics as safe handling, air brakes on doubles and triples, coupling and uncoupling, rollovers, and trailer sway. This knowledge test is based on the official Idaho CDL manual (Idaho CDL Handbook 2025), especially Chapter 7: Doubles and Triples. You likely studied other chapters of this manual to get your CDL and perhaps obtain some other endorsements too. But before you go back to the manual once again, this time to study for the Double/Triple endorsement, we would like to offer you a smarter approach. It supplements the manual to ensure you’ll pass the Double/Triple knowledge test on your first try.
This Idaho Doubles and Triples Endorsement Practice Test is based on 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 address such topics as air lines, converter dollies, coupling, following distance, rearward amplification, and rollovers.
If you need help answering a practice question, ask our AI Assistant 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. Disappointed with your final score? You can retake this practice test as often as you wish.
- 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 ID 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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