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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 conducting a pre-trip inspection:
the inspection report should only be reviewed if you will be carrying passengers.
you should review the last vehicle inspection report.
the vehicle inspection report should not be reviewed unless your supervisor tells you to do so.
2. When you turn suddenly, which trailer is most likely to turn over?
The last trailer of triples
The rear trailer of doubles
The front trailer
3. In a dual air brake system, if one air system is very low on pressure:
either the front or rear brakes will not be operating fully.
you should drive and brake as you always have.
you should pump the brakes to restore pressure.
4. When the spring brakes are on, you should:
press the accelerator.
not push the brake pedal down.
pump the brakes.
5. As you approach off ramps and on ramps, remember:
that downgrades make it easier to reduce speed.
to always brake and turn at the same time.
that the posted speed limit may not be safe for larger vehicles.
6. Which of the following is not proper tie-down equipment:
Bungee cords
7. Headache racks:
protect you from being hit by your cargo.
can blind other drivers.
help you keep weights within legal limits.
8. If an aggressive driver confronts you, you should NOT:
ignore gestures.
make eye contact.
try to let them pass.
9. When a combination vehicle goes around a corner:
the driver must keep the rear of your vehicle far away from the curb.
the front and rear wheels follow a different path.
the rear wheels of the trailer will never off-track.
10. You can release dolly brakes:
by opening the air tank petcock.
by closing the emergency line valve.
by opening the service line valve.
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HI Doubles Triples Test

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