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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 Indiana doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The IN CDL doubles triples test covers the following sections of the Indiana CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this IN CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Indiana.
1. If the low air pressure warning light comes on, you should:
stop immediately.
set the parking brake.
call for help.
continue to drive normally.
2. An item that is 15 feet long placed on a flatbed trailer should have at least:
3 tie-downs.
15 tie-downs.
1 tie-down.
2 tie-downs.
3. "Bobtail" tractors are:
tractors without semitrailers.
tractors with two trailers.
heavily loaded trailers.
tractors with a tank.
4. To prevent a rollover, the driver should:
pay extra attention to the coolant level.
drive slowly around corners, on ramps, and off ramps.
make quick lane changes if possible.
drive on the shoulder if possible.
5. If the engine catches fire, you should:
pull into a service station and notify the emergency services.
open the hood as soon as you can.
turn off the engine as soon as you can.
avoid shooting foam from the vehicle's underside.
6. Which of the following may have reduced the clearances since the heights were posted at bridges and overpasses?
The weight of a cargo
Repaving of the road
7. Doubles and triples:
can be stopped suddenly due to their weight.
have a lower chance of skidding.
can't be turned suddenly.
can be turned suddently due to the low center of gravity.
8. Drivers transporting cargo are responsible for:
making sure the cargo is properly secured.
inspecting the cargo.
recognizing overloads.
All of the above.
9. Do NOT use the parking brakes:
when you park for less than two hours.
if the brakes are very hot.
to test that they work.
when you leave your vehicle.
10. If you must make an emergency stop, you should:
brake in a way that will keep your vehicle in a straight line.
apply the brakes as hard as you can to lock them.
use the hand brake before the brake pedal.
None of the above.
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IN 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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