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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 Delaware doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The DE CDL doubles triples test covers the following sections of the Delaware CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this DE CDL practice test now to prepare for the actual test!
1. 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.
2. The parking brake:
should be used when driving in bad weather.
should be used when you need to apply the brakes firmly.
should be used whenever you park.
All of the above.
3. For safety during a trip, you should:
watch gauges for signs of trouble.
use your senses to check for problems.
check critical items when you stop.
All of the above.
4. Hanging meat in a refrigerated truck:
will not affect safe driving ability.
creates a low center of gravity.
can be a very unstable load.
should never be transported.
5. Placards are:
signs put inside a vehicle used to warn others of hazardous materials.
a type of safety equipment.
signs placed on a vehicle to identify the hazard class of the cargo.
devices placed below a vehicle to improve traction.
6. Dollies with ABS are required to have a malfunction lamp:
on the left side.
on the rear.
on the right side.
on the front.
7. You as a driver should always:
make emergency plans when you see a hazard.
stay in your lane.
reduce your following distance.
drive slowly in the left lane of traffic.
8. Blocking is used to:
protect the cargo from weather.
keep the cargo from sliding.
protect people from spilled cargo.
All of the above.
9. When driving with more than one trailer, the _______ trailer should be the first one behind the tractor.
10. What is the most important reason to inspect your vehicle?
Saving money by preventing costly repairs.
Vehicle inspection is required by federal and state laws.
Achieving the best gas mileage.
Your safety and that of other road users.
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DE CDL Doubles Triples Test

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