Save Time and Get a Pass Guarantee! LIMITED-TIME OFFER: Get CDL PREMIUM Now and SAVE $64! Upgrade To Premium


View instructions
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. The posted speed for a curve that may be safe for a straight truck:
could be too fast for a double or triple.
is likely to be safe for a double or triple.
can be ignored when driving a double or triple.
2. ABS helps you:
keep the wheels from locking up.
decrease your average speed.
lock your wheels.
3. Having ABS on only the trailer:
is very dangerous.
makes the trailer more likely to swing out.
still gives you more control over your vehicle during braking.
4. When you discover a fire, if the trailer doors are hot you should not open them because:
opening the doors lets air in and may make the fire flare up.
with air many fires do less damage.
the temperature of the trailer should not be changed in any way.
5. The space under a heavily loaded vehicle can be very small. This can cause problems:
on dirt roads.
when crossing railroad tracks.
All of the above.
6. Retarders:
help slow a vehicle and reduce brake wear.
apply their braking power whenever you push on the accelerator.
help prevent accidents by applying extra braking power to the non-drive wheels.
7. Doubles/triples are:
usually faster than most CMVs.
easier to drive than other CMVs.
less stable than other CMVs.
8. You should test the coupling by:
pulling against the pin of the second semitrailer.
applying the parking brakes so the rig will not move.
locking the pintle hook.
9. If a load is 50 feet long, the minimum number of tie-downs required is:
10. Before operating the vehicle, the driver should:
rely on the last vehicle inspection and skip the pre-trip inspection.
should not review the vehicle inspection report and immediately try to find any vehicle defects.
review the last vehicle inspection report.
Page 1 of 2
Next page  
Rate This Free Test
4.6 out of 5
based on 250 votes

VT CDL Doubles 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%
Share This Online CDL Test