- Updated for January 2025
- Based on 2025 WA commercial driver's license manual
Free WA CDL Double/Triple Trailers Practice Test 2025
From the wet, forested, and sometimes steep terrain of the Cascade Mountains in the west to the dryer, sunnier areas in the east, Washington offers incredible opportunities to drivers with the Double/Triple Trailers (T) endorsement. You’re here, so you must be considering adding this endorsement to your Washington Commercial Driver’s License (CDL). Boosting your qualifications and earning potential is a smart move, and the best part is, you’re nearly there already. After passing a 20-question multiple-choice knowledge test with a score of 80% (16 correct answers) you’ll receive the “T” endorsement on your CDL, granting you the ability to legally tow two or three trailers (where laws allow) (Washington CDL Handbook 2025).
Though this endorsement does qualify you for pulling doubles and triples, triples are not allowed in Washington due to the challenging mountain passes and urban traffic. In the Evergreen State, you can add the double/triple trailers endorsement to your CDL once you turn 18 years of age; however, if you’re planning on traveling across state lines, 21 years of age is the federal requirement. Something to also keep in mind is that doubles may not exceed a total combination length of 105 feet. But, make no mistake, in Washington, double trailers are often used for the transport of a wide variety of cargoes that include agricultural products (apples, cherries, potatoes, and wheat), timber and forestry products, seafood and processed food, industrial goods and machinery (including the aerospace industry), and consumer goods and electronics from hubs located in Seattle and Spokane. I can hear you now: “How do I get this done?”
The best way is to use our online Washington CDL Double/Triple Trailers Endorsement practice test designed to simplify the task of studying. With no unnecessary excess, our fine-tuned approach is specific to the test material and format you’ll face at the DOL. Up to date as of January 2025, this practice test includes 20 multiple-choice questions and instant feedback with each question, which is a far more effective way to learn than facing all of the feedback at the end.
When you have worked with our practice tests to the point of feeling confident and ready, just head over to the DOL and apply. Bring your documents, pay the fee, pass the test, and get the “T” endorsement!
- 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 WA DOL exam
questions
correct answers to pass
passing score
Helpful links
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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