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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 Dakota doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The SD CDL doubles triples test covers the following sections of the South Dakota CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this SD CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in South Dakota.
1. Do NOT use the parking brakes:
to test that they work.
if the brakes are very hot.
when you leave your vehicle.
when you park for less than two hours.
2. How far ahead do most good drivers look?
50 to 60 seconds
6 to 8 seconds
3 to 4 seconds
12 to 15 seconds
3. A low air pressure warning signal:
is required on vehicles with air brakes.
is optional on vehicles with air brakes.
is required on all vehicles without air brakes.
None of the above.
4. When driving trucks with trailers, drivers should:
push the brake pedal to the floor when braking.
avoid making sudden movements with the steering wheel.
decrease their following distance.
make quick lane changes.
5. If a load is 10 feet long, the minimum number of tie-downs required is:
6. When you double your speed, the braking distance is:
3 times longer.
the same.
4 times longer.
2 times longer.
7. Containerized loads are used:
when the cargo exceeds the weight limit.
when transporting liquids.
when transporting explosives.
when the cargo has been or will be carried by rail or ship.
8. If a load is placed on one side of the trailer:
making turns may be easier.
a rollover is more likely.
your brakes won't work.
the steering axle weight will be too light to steer safely.
9. The trailer hand valve should be used:
to check that the fire extinguisher is charged.
to check that the trailer emergency brakes are on.
to check that the trailer is locked onto the tractor.
to test the trailer brakes.
10. You should be especially alert for drunk drivers:
around shopping areas.
late at night.
in the early evening.
in the morning.
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SD CDL Doubles Triples 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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