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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. The maximum amount of play in a 20-inch steering wheel is:
1/4 inch
5 inches
2 inches
1/2 inch
2. If there is a fire and you are not sure what to use to put it out, you should:
wait for firefighters.
use a fire extinguisher.
use water.
use dry powder.
3. Tire load is defined as:
the minimum safe weight a tire can carry at a specified pressure.
the maximum safe weight a tire can carry at a specified pressure.
the weight transmitted to the ground by 1 tire.
the minimum tire pressure.
4. When stopping you should push the brake pedal down:
as hard as you can.
5. On front tires, tread should be at least:
4/16 inch
2/32 inch
1/16 inch
4/32 inch
6. Longer combination vehicles have the tendency to swing wide on turns. This is called:
7. Which of the following will NOT help you prevent rollover?
Driving slowly around turns.
Keeping the cargo as close to the ground as possible.
Using the controlled braking method.
All of the above.
8. Blocking and bracing are:
used to keep cargo from sliding and to prevent movement of cargo.
coupling devices used to connect the service air lines from the truck or tractor to the trailer.
driving techniques used to regain control when your drive wheels start to skid.
None of the above.
9. Which of the following is not a type of retarder?
10. When driving, you should check mirrors regularly to know where other vehicles are around you. Remember that:
convex mirrors make things look larger and closer than they really are.
you should check your after the start of any trip to make sure they are properly adjusted.
every registered motor vehicle must have at least one mirror.
there are blind spots that your mirrors cannot show you.
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IN CDL Doubles Triples Test

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