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View All Plans- Updated for April 2025
- Based on 2025 WY commercial driver's license manual
Free WY CDL Double/Triple Trailers Practice Test 2025
Do you want to drive combination trucks with two or even three trailers? Good news! Besides Double Pup vehicles, Wyoming also allows the following types of Long Combination Vehicles (LCVs) on officially designated routes (primarily I-80): Rocky Mountain Double, Turnpike Double, and Triple. (You may need an oversize permit if your vehicle exceeds the state’s length or weight limits.) However, only a minority of truck drivers are qualified and trained to operate LCVs, so demand for such drivers is high.
In Wyoming, the logistics and freight sector heavily uses double trailers for efficient transport. FedEx Freight, TForce Freight, and XPO Logistics use double or triple trailers for freight distribution. In the energy sector, HF Sinclair uses Rocky Mountain Doubles and Triples for fuel distribution. Peabody Energy and Arch Resources use double coal hoppers to transport coal from mines to rail. Cargill and ADM (Archer Daniels Midland) use double grain hoppers to transport wheat and corn. Tyson Foods and JBS USA use double livestock trailers to transport cattle.
To legally pull doubles or triples, you must hold a Class A CDL and obtain a Double/Triple (T) endorsement on your CDL. Wyoming also requires drivers of Turnpike Doubles or Triples to complete an LCV Driver Training Program.
To get the T endorsement, you must pass the Double/Triple knowledge test. This official test covers such topics as safe handling, air brakes on doubles and triples, coupling and uncoupling, pre-trip inspections, emergency situations, and state and federal regulations on doubles and triples. (No special skills test is required for this endorsement.)
This knowledge test is based on the official Wyoming CDL manual (Wyoming CDL Handbook 2025), especially Chapter 7: Doubles and Triples. We can help you pass the knowledge test on your first try – something you can’t ensure just by reading the manual.
This is the first of our five Wyoming Doubles and Triples Endorsement Practice Tests. It’s based on Chapter 7 of the official CDL manual, just like the Double/Triple knowledge test. It’s up to date as of April 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 or further elaboration if you get stuck on a question or an immediate explanation of the correct answer if you still miss the question. You can also ask it your own questions about driving.
This practice test isn’t timed; take all the time you want. You can also retake this practice test as often as you wish until you’ve mastered the material.
- 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 WY DOT 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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