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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. You should be especially alert for drunk drivers:
in the morning.
around shopping areas.
late at night.
2. As you approach off ramps and on ramps, remember:
that the posted speed limit may be safe for automobiles, but may not be safe for larger vehicles.
that braking and turning at the same time can be a dangerous.
All of the above.
3. When connecting to the rear trailer, the trailer height should be:
the same height as the fifth-wheel.
lower than the center of the fifth-wheel.
higher than the center of the fifth-wheel.
4. The tractor protection valve:
supplies air to the trailer air tanks.
controls the emergency brakes on combination vehicles.
keeps air in the tractor brake system should the trailer break away or develop a bad leak.
5. If during vehicle inspection a tire is too hot to touch, you should:
let air out.
remain stopped until the tire cools off.
immediately decrease air pressure.
6. Rough acceleration can cause:
damage electrical and brake lines.
tire damage.
mechanical damage.
7. Do NOT use the parking brakes:
when you leave your vehicle.
if the brakes are very hot.
when you park for less than two hours.
8. Fully loaded rigs:
are much more likely to roll over than empty rigs.
are less likely to roll over than empty rigs.
are just as likely to roll over as empty rigs.
9. When driving at night you should dim your lights when following another vehicle within:
100 feet.
500 feet.
1 mile.
10. A red triangle with an orange center means:
Law enforcement vehicle
The vehicle is hauling hazardous materials
Slow-moving vehicle
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HI CDL Doubles Triples Test

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