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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 Wyoming doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The WY CDL doubles triples test covers the following sections of the Wyoming CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this WY CDL practice test now to prepare for the actual test!
1. ABS helps you:
brake harder.
drive faster.
stop faster.
None of the above.
2. 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.
3. By pushing the trailer air supply control knob in, you:
shut the air off and put on the trailer emergency brakes.
keeps air in the tractor or truck brake system.
supply the tires with air.
supply the trailer with air.
4. Air brakes:
are an effective way to stop large and heavy vehicles.
should be used only when driving on wet roads.
can improve fuel efficiency.
are prohibited on larger vehicles.
5. You have two tie-downs on a 15 foot load. How many more tie-downs do you need to secure cargo and keep it from shifting or falling?
6. Headache racks:
protect you from being hit by your cargo.
can blind other drivers.
help you keep weights within legal limits.
None of the above.
7. As you approach off ramps and on ramps, remember:
that braking and turning at the same time can be a dangerous.
to slow down  before you get on the curved part of an off ramp or on ramp.
that the posted speed limit may be safe for automobiles, but may not be safe for larger vehicles.
All of the above.
8. Before each trip, you must make sure:
your cargo obscures your view to the sides.
the cargo has a high center of gravity.
the truck is overloaded.
the cargo is balanced and secured.
9. Most heavy trucks with manual transmissions require ____ to change gears.
triple clutching
double clutching
single clutching
None of the above.
10. To prevent rollover, you should do all of the following except:
avoid quick lane changes.
keep the load centered on your rig.
drive slowly around turns.
put the lightest parts of the cargo under the heaviest parts.
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WY CDL Doubles Triples Test

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