FREE CDL Doubles/Triples Practice Test 2026

The Doubles/Triples (T) endorsement is required to pull two or three trailers. It covers coupling and uncoupling multiple trailers, inspecting them, and the unique handling and rollover risks of these long combinations.

20 questions80% to passExplanations included

Question 1 of 12

On the rearmost trailer, the air line shut-off valve at the back should be:

Tip: Press 1-4 to select, Enter to submit

FREE CDL Doubles/Triples Practice Test 2026

On the rearmost trailer, the air line shut-off valve at the back should be:

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