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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 District of Columbia doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The DC CDL doubles triples test covers the following sections of the District of Columbia CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this DC CDL practice test now to prepare for the actual test!
1. 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?
2. If the drive wheels begin to spin, you should:
take your foot off the accelerator.
wait 4-5 seconds before applying the accelerator.
accelerate smoothly and change gears as necessary.
apply your brakes all the way.
3. Blocking is used to:
keep the cargo from sliding.
protect the cargo from weather.
protect people from spilled cargo.
All of the above.
4. Skids caused by acceleration can usually be stopped by:
speeding up.
taking the foot off the accelerator.
applying the brakes firmly.
coming to a complete stop.
5. You as a driver should always:
make emergency plans when you see a hazard.
stay in your lane.
drive slowly in the left lane of traffic.
reduce your following distance.
6. Foundation brakes are used:
only with the rear wheels.
at each wheel.
only with the right wheels.
only with the front wheels.
7. When backing, you should:
only use mirror on the driver's side.
back and turn toward the right side whenever possible.
use the mirrors on both sides.
back quickly.
8. Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
greater; less
less; more
greater; more
less; less
9. Which of the following will off-track the most?
The rear wheels of the last trailer.
The front wheels of the tractor.
The rear wheels of the tractor.
The front wheels of the last trailer.
10. Most heavy trucks with manual transmissions require ____ to change gears.
triple clutching
single clutching
double clutching
None of the above.
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DC CDL Doubles 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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