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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 Utah doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The UT CDL doubles triples test covers the following sections of the Utah CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this UT CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Utah.
1. Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
the parking brake should never used to slow the vehicle.
shifting into neutral may help slow the vehicle.
All of the above.
2. In your mirror, you see a car approaching from the rear. The next time you check your mirror, you don't see the car. If you wish to change lanes, you should:
ease into the other lane slowly so the other car can get out of the way.
assume the car left the roadway and change lanes as normal.
wait until you are sure the car isn't in your blind spot.
None of the above.
3. What is the minimum tread depth for tires other than front tires?
4/16 inch
2/32 inch
8/32 inch
4/32 inch
4. Warnings on low bridges or underpasses:
must be posted.
are often posted, but sometimes they are not.
are always posted.
None of the above.
5. When backing, it is best to:
use a helper whenever possible.
use only the passenger's side mirror.
back toward the passenger's side when possible.
try to back in the direction of the drift.
6. You should test the coupling by:
locking the pintle hook.
applying the parking brakes so the rig will not move.
disconnect the safety chains.
pulling against the pin of the second semitrailer.
7. Emergency lines are often coded with the color ___ to keep from getting them mixed up with the service line.
8. You are driving a double. Before entering traffic, you should:
make sure you have a large enough gap before entering or crossing traffic.
always come to a complete stop.
assume there is enough room to merge into traffic.
turn on your headlights.
9. When backing, you should:
use the mirrors on both sides.
back and turn toward the right side whenever possible.
back quickly.
only use mirror on the driver's side.
10. During freezing weather, which area is most likely to be slippery after it rains?
Shaded areas.
Roads that look wet.
All of the above.
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UT CDL Doubles Test

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