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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Oklahoma doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The OK CDL doubles triples test covers the following sections of the Oklahoma CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this OK CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Oklahoma.
1. Glad hands are:
securement devices.
warning devices.
coupling devices.
2. If a tire fails while you are driving, you should:
call your supervisor for instructions.
stop on the roadway if possible.
stay off the brake until your vehicle has slowed down.
3. To use the controlled braking method in an emergency, you should:
apply your brakes all the way, and release the brakes when the wheels lock up.
apply the brakes when the wheels lock up.
apply the brakes as hard as you can without locking the wheels.
4. Large vehicles take longer to stop when they are:
fully loaded.
heavily loaded but not fully loaded.
5. A low air pressure warning signal:
is required on all vehicles without air brakes.
is optional on vehicles with air brakes.
is required on vehicles with air brakes.
6. Texting while driving a CMV is:
acceptable if the message work-related.
acceptable if the message less than 140 characters.
7. Before connecting the converter dolly to the rear trailer, make sure that:
the shut-off valves at the rear of the first trailer are open.
the kingpin rests on the fifth-wheel.
the trailer height is slightly lower than the center of the fifth-wheel.
8. When inspecting the coupling, make sure the fifth-wheel jaws have closed around the:
the electrical cord.
shank of the kingpin.
head of the kingpin.
9. Which of the following may have reduced the clearances since the heights were posted at bridges and overpasses?
Repaving of the road
The weight of a cargo
10. When preparing to make a right turn, you should NOT turn wide to the left as you start the turn. Why?
Turning wide to the left can cause your vehicle to tilt.
It makes the turn harder.
A following driver may try to pass you on the right.
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OK CDL Doubles Triples Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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