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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 West Virginia doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The WV CDL doubles triples test covers the following sections of the West Virginia CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this WV CDL practice test now to prepare for the actual test!
1. If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:
the springs to put on the brakes.
the vehicle to slide back and forth.
the trailer supply valve to open.
the trailer emergency brakes to come on.
2. You hear a loud "bang" which sounds like a tire blowout. You should:
check the tires at the next stop.
assume you have a tire failure.
keep driving as normal.
inspect your tires with your mirrors.
3. You should flash your brake lights to warn drivers behind you when:
you see a hazard that will require slowing down.
you see a bus stops in the roadway ahead to unload passengers.
you see you'll need to slow down.
All of the above.
4. The earliest way to recognize that your trailer has started to skid is:
by checking the jackknife sensor.
by hearing squeaking noises from the wheels.
by checking your mirrors.
by releasing the brakes.
5. Which of the following statements about drivers fixing an engine or changing a tire is true?
Roadway traffic is not a danger to them.
They usually pay attention to the danger roadway traffic is to them.
They often do not pay attention to roadway traffic.
They must park within 5 feet of the roadway.
6. ABS:
may cause your wheels to lock when you break hard.
helps you stop faster.
helps you avoid skids caused by over braking.
improves your visibility at night.
7. For safe handling, the heaviest trailer should be:
the last trailer.
behind the tractor.
the second trailer in a triple.
None of the above.
8. If during vehicle inspection a tire is too hot to touch, you should:
remain stopped until the tire cools off.
let air out.
immediately decrease air pressure.
make sure there is enough engine oil on the tires.
9. On any upgrade, gravity:
doubles your speed.
doesn't affect your speed.
slows you down.
speed you up.
10. Hydroplaning:
can occur only if there is a lot of water on the road.
can occur at speeds as low as 10 mph, if there is a lot of water.
is less likely if tire pressure is low.
can occur at speeds as low as 30 mph.
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WV Doubles Triples CDL Test

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