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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 Hawaii doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The HI CDL doubles triples test covers the following sections of the Hawaii CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this HI CDL practice test now to prepare for the actual test!
1. When preparing to make a right turn, you should NOT turn wide to the left as you start the turn. Why?
A following driver may try to pass you on the right.
Turning wide to the left can cause your vehicle to tilt.
It makes the turn harder.
2. The tire load for each tire is stated:
on the side of the tire.
on the tread of the tire.
on the inside of the tire.
3. Skids caused by acceleration can usually be stopped by:
coming to a complete stop.
applying the brakes firmly.
taking the foot off the accelerator.
4. Hanging meat in a refrigerated truck:
can be a very unstable load.
should never be transported.
will not affect safe driving ability.
5. By pushing the trailer air supply control knob in, you:
supply the trailer with air.
shut the air off and put on the trailer emergency brakes.
supply the tires with air.
6. On any upgrade, gravity:
slows you down.
doubles your speed.
speed you up.
7. Retarders:
reduce braking distance.
help slow a vehicle, reducing the need for using brakes.
improve gas mileage.
8. Which of the following statements about backing heavy vehicles is true?
You should avoid backing whenever you can.
Always back as quickly as possible.
Back to the right side so that you can see better.
9. You are driving a modern truck with a manual transmission. When going down a hill you should usually:
use a lower gear than would be required to go up the hill.
shift into neutral and coast.
use the same gear you would use to go up the hill.
10. When the wheels of a trailer lock up:
the trailer will tend to swing around.
ABS will increase stopping power.
the vehicle will gradually come to a complete stop.
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HI Doubles Triples CDL Test

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