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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 Vermont doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The VT CDL doubles triples test covers the following sections of the Vermont CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this VT CDL practice test now to prepare for the actual test!
1. Rims with welding repairs:
can be used for tires in the rear of the vehicle.
can be used for tires in the front of the vehicle.
are not safe.
2. When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
The air could leak out of the trailer air tank, releasing its emergency brakes.
You may not notice a major leak in the service line until you try to put the brakes on.
if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
3. Which of the following vehicles is most likely to turn over?
Triple trailer
65 ft. conventional double
3 axle tractor semitrailer
4. For safe handling, the heaviest trailer should be:
the second trailer in a triple.
behind the tractor.
the last trailer.
5. If brakes fail on a long downgrade, you should:
pump the brake pedal 3 times.
turn off the engine as soon as you.
use an escape ramp if it is available.
6. What factors can cause brakes to fade?
Excessive heat and brakes out of adjustment.
Dirt roads and in unpaved yards.
Slippery surfaces and shaded areas.
7. Which of the following is NOT a reason for hydraulic brake failure?
Brake fade on long hills
Stab braking
Loss of hydraulic pressure
8. Doubles:
are less likely to rollover than straight trucks.
require more reaction time than straight trucks.
None of the above.
9. You are driving a double. Before entering traffic, you should:
make sure you have a large enough gap before entering or crossing traffic.
turn on your headlights.
assume there is enough room to merge into traffic.
10. When you push in the red trailer air supply knob, this will:
open the emergency line shut-off valve at the rear of the last trailer.
disconnect the air lines from the trailer.
supply air to the emergency supply lines.
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Doubles Triples VT CDL Test

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