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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 Rhode Island doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The RI CDL doubles triples test covers the following sections of the Rhode Island CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this RI CDL practice test now to prepare for the actual test!
1. When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:
the trailer supply valve will stay open.
the trailer emergency brakes will come on.
the tractor will lose all air pressure.
2. The weight of a truck:
has an impact on stopping distance.
has no effect on stopping distance.
is not as important as the vehicle's center of gravity in determining stopping distance.
3. A red triangle with an orange center means:
Slow-moving vehicle
The vehicle is hauling hazardous materials
Law enforcement vehicle
4. 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.
5. Emergency brakes must be held on by:
mechanical force.
hydraulic pressure.
air pressure.
6. In your mirror, you see a car approaching from the rear. The next time you check your mirror, you don't see the car. If you wish to change lanes, you should:
wait until you are sure the car isn't in your blind spot.
ease into the other lane slowly so the other car can get out of the way.
assume the car left the roadway and change lanes as normal.
7. Do NOT use the parking brakes:
when you park for less than two hours.
if the brakes are very hot.
when you leave your vehicle.
8. How should you brake if your vehicle loses ABS?
Pump the brake repeatedly
Step on and off the brake pedal several times
Brake as you always have.
9. ABS helps you:
brake harder.
drive faster.
None of the above.
10. Driving in very hot weather:
should never be done.
can increase tire pressure.
can decrease oil pressure.
 
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RI CDL Doubles Triples Test

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