Free CDL Doubles/Triples Practice Test 2025
Doubles/Triples drivers earn up to $80,000/year - 70% more than standard CDL jobs. Our free practice tests help you pass the T endorsement exam on your first try.
20 questions, 80% to pass
Doubles/Triples Endorsement at a Glance
Key facts about the test and the process to get your T endorsement
20
Questions
80%
Passing Score
1 week
Time to Complete
Free Doubles/Triples Practice Test
20 real exam-like questions with instant feedback. See how ready you are!
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How to Get Your Doubles/Triples Endorsement
Here's the step-by-step process to add the T endorsement to your CDL.
1
Meet Basic Requirements
You must already hold a valid Class A CDL. The Doubles/Triples endorsement cannot be added to Class B or C licenses.
2
Study the CDL Manual
Focus on Section 7: Doubles and Triples. Learn about coupling/uncoupling, rearward amplification (crack-the-whip effect), and safe driving techniques.
3
Pass the Written Test
Take the 20-question Doubles/Triples knowledge test at your DMV. You need 80% (16 correct) to pass. No skills test is required.
4
Get Your CDL Updated
After passing, your CDL is updated with the "T" endorsement. You can now legally drive double and (where allowed by state law) triple trailer combinations.
Official Resources
Government websites for Doubles/Triples endorsement requirements
Want More Practice?
Continue practicing with state-specific Doubles/Triples tests based on your CDL manual.
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Frequently Asked Questions
What is a Doubles/Triples endorsement?
A Doubles/Triples endorsement (code "T") authorizes you to pull two or three trailers behind a tractor. This is one of the easiest endorsements to get - written test only, no skills test.
What CDL class do I need?
You must have a Class A CDL. The Doubles/Triples endorsement cannot be added to Class B or C licenses because you need the Class A rating to pull trailers.
What is rearward amplification?
Also called the "crack-the-whip" effect, rearward amplification means that sudden steering movements affect each successive trailer more than the one ahead of it. The last trailer in a triple can swing 3x more than the first trailer.
How should trailers be arranged?
Always put the heaviest trailer closest to the tractor and the lightest trailer at the rear. This reduces the crack-the-whip effect and makes the combination more stable.
How many questions are on the Doubles/Triples test?
20 questions, multiple choice. You need 16 right to pass (80%). No skills test is required for this endorsement.
What topics are covered on the test?
The test covers: coupling and uncoupling procedures, inspecting doubles/triples, air brake connections, rearward amplification, safe driving techniques, and rollover prevention.
Are doubles/triples legal in all states?
Double trailers (28.5 feet each) are legal on designated highways nationwide. Triple trailers are more restricted - only about 20 states allow them, mostly in the West and Midwest.
How much do Doubles/Triples drivers earn?
LTL (Less Than Truckload) carriers that use doubles often pay $80,000+/year. These are typically regional routes with home time, making them popular positions.
Is there a skills test for Doubles/Triples?
No! The Doubles/Triples endorsement requires only a written knowledge test. This makes it one of the easiest CDL endorsements to obtain.
How long is the Doubles/Triples endorsement valid?
The endorsement is valid as long as your CDL is valid. When you renew your CDL, you may need to retake the knowledge test depending on your state's requirements.
What Test-Takers Say
"My Doubles/Triples test was almost word for word from the study tests here. Took only 2 minutes to get 100%."
"Used this for my Texas Doubles/Triples test. Every single one of the 20 questions were on the practice test. Perfect score."
"Was at the DMV for 30 minutes. Got 20/20. Way better than paying $500 for a trucking school course."
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