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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 South Carolina doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The SC CDL doubles triples test covers the following sections of the South Carolina CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this SC CDL practice test now to prepare for the actual test!
1. Which of the following statements about drivers fixing an engine or changing a tire is true?
They often do not pay attention to roadway traffic.
They usually pay attention to the danger roadway traffic is to them.
Roadway traffic is not a danger to them.
They must park within 5 feet of the roadway.
2. You should be especially alert for drunk drivers:
around shopping areas.
late at night.
in the morning.
in the early evening.
3. 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?
4. When coupling double trailers, you can secure the second trailer by:
setting the trailer emergency brakes.
chocking the wheels.
using the trailer spring brakes.
All of the above.
5. Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:
hydraulic brakes.
a rear backup camera.
anti-lock brakes.
6. Placards are:
a type of safety equipment.
devices placed below a vehicle to improve traction.
signs put inside a vehicle used to warn others of hazardous materials.
signs placed on a vehicle to identify the hazard class of the cargo.
7. Another name for front-end header boards is:
headache racks.
cargo stopper.
head belt.
containerized racks.
8. Rims with welding repairs:
are not safe.
can be used for tires in the front of the vehicle.
are acceptable only when carrying a heavy load.
can be used for tires in the rear of the vehicle.
9. Fully loaded rigs:
are just as likely to roll over as empty rigs.
are much more likely to roll over than empty rigs.
are less likely to roll over than empty rigs.
None of the above.
10. Pre-trip inspections are:
required by law
required only for trips of more than 100 miles.
required only for trips of more than 50 miles.
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SC CDL Doubles Triples Test

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