Driving · Commercial
CDL Doubles/Triples (T) Endorsement Test
The knowledge test for the T endorsement: handling doubles and triples, converter dollies, coupling and uncoupling twin and triple trailers, extra inspection items and air brake checks.
Questions last checked against the official sources on October 10, 2026.
The real exam at a glance
- Questions
- 20 (varies by state)
- To pass
- 80% (16 of 20)
- Time
- About 20 minutes (varies by state)
- Test type
- Knowledge test only
- Based on
- Section 7 of your state's CDL manual
What you'll practise
Try a question
When parking doubles or triples, what spot should you avoid?
- One you cannot pull straight through
- One with good lighting
- One on level pavement
- One next to other parked trucks
Show the answer
A. One you cannot pull straight through — Make sure you do not get in a spot you cannot pull straight through (CDL Manual 7.1.7)
Sample questions by topic (in English)
- Endorsement rules
- Pulling doubles and triples
- Converter dollies
- Coupling
- Uncoupling
- Inspecting doubles and triples
- Air brake checks
Ask the examiner
Ask about this exam: why an answer is wrong, a grammar point, or “quiz me on …”.
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Questions about the CDL Doubles/Triples
Is this the official CDL Doubles/Triples?
No. Semplr is independent and not affiliated with the exam body. We write every question ourselves, in the official format and at the official level.
What is the real CDL Doubles/Triples like?
Questions: 20 (varies by state). To pass: 80% (16 of 20). Time: About 20 minutes (varies by state). Test type: Knowledge test only. Based on: Section 7 of your state's CDL manual.
How is my practice marked?
Instantly. You see your score against the pass mark, and an explanation for every question — including the ones you got right.
Can I take it on my phone?
Yes. The whole mock exam works on a phone, and your progress is saved in your browser.
Ready for a full run?
One sitting, real timing, then your score against the pass mark.
Start the free mock exam