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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 Massachusetts doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The MA CDL doubles triples test covers the following sections of the Massachusetts CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this MA CDL practice test now to prepare for the actual test!
1. Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
shifting into neutral may help slow the vehicle.
the parking brake should never used to slow the vehicle.
pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
All of the above.
2. Emergency lines are often coded with the color ___ to keep from getting them mixed up with the service line.
3. Which of the following will NOT help you prevent rollover?
Keeping the cargo as close to the ground as possible.
Driving slowly around turns.
Using the controlled braking method.
All of the above.
4. Which of the following is most likely to roll over?
The front trailer of a double
The middle trailer of a triple
The rear trailer of a triple
The rear trailer of a double
5. You should do an after-trip inspection:
at least once a week.
once a month.
after each trip.
after each stop.
6. To prevent rollover, you should do all of the following except:
avoid quick lane changes.
drive slowly around turns.
keep the load centered on your rig.
put the lightest parts of the cargo under the heaviest parts.
7. Which of the following is a good way to avoid becoming an aggressive driver?
Be realistic about your travel time.
Avoid talking on your cell phone.
Keep your following distance reasonable.
All of the above.
8. Air tanks usually hold enough compressed air to allow the brakes to be used _________ even if the compressor stops working.
for one stop
for 3 days
several times
for one day
9. When coupling double trailers, you can secure the second trailer by:
chocking the wheels.
setting the trailer emergency brakes.
using the trailer spring brakes.
All of the above.
10. After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.
25 miles
20 miles
two hours
50 miles
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Doubles Triples MA CDL Test

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