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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 Texas doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The TX CDL doubles triples test covers the following sections of the Texas CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this TX CDL practice test now to prepare for the actual test!
1. Texting is:
the most dangerous distraction.
safer thanĀ  engaging in conversation with a passenger.
safer than talking on a cell phone.
about as safe as adjusting the radio.
2. In a combination vehicle, ________ is most likely to turn over.
the last trailer
the tractor
the trailer behind the tractor
All of the above.
3. Air brakes:
are an effective way to stop large and heavy vehicles.
are prohibited on larger vehicles.
should be used only when driving on wet roads.
can improve fuel efficiency.
4. The application pressure gauge:
tells you how much pressure is in the air tanks.
shows how much air pressure is being applied to the brakes.
stops the compressor from pumping air.
protects the tank and the rest of the system from too much pressure.
5. What is Gross Vehicle Weight?
The total weight of a single vehicle, excluding its load
The total weight of a combination of vehicles excluding the load
The total weight of a single vehicle, including its load
The total weight of the cargo
6. To prevent a rollover, the driver should:
drive slowly around corners, on ramps, and off ramps.
make quick lane changes if possible.
drive on the shoulder if possible.
pay extra attention to the coolant level.
7. Emergency lines are often coded with the color ___ to keep from getting them mixed up with the service line.
8. Before each trip, you must make sure:
the cargo has a high center of gravity.
the cargo is balanced and secured.
the truck is overloaded.
your cargo obscures your view to the sides.
9. When driving a 60-foot truck at 50 mph, your minimum following distance should be:
3 seconds
6 seconds
5 seconds
7 seconds
10. You should be especially alert for drunk drivers:
in the early evening.
around shopping areas.
in the morning.
late at night.
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TX CDL Doubles Triples Test

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