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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. An ABS system:
is a safety anti-skid braking system.
helps increase a vehicle's stopping power.
requires a change in the way you brake.
decreases your stopping distance.
2. On front tires, tread should be at least:
1/16 inch
4/16 inch
2/32 inch
4/32 inch
3. When going down grades, you should:
put the transmission in Neutral.
rely solely on engine braking to reduce your speed.
downshift to a lower gear.
shift up.
4. The posted speed limit for a curve:
is safe for all vehicles.
may be too fast for many trucks or buses.
is optional and may be exceeded.
is safe for trucks or buses, but it may be too fast for cars.
5. Before driving a vehicle with a dual air system, the air compressor should build up a minimumĀ of _____ pressure in both the primary and secondary systems.
100 psi
50 psi
10 psi
75 psi
6. Who is responsible for inspecting the cargo?
The person who loaded and secured the cargo
The driver
The motor carrier
The shipper
7. Air pressure should build up in a single air system, within about:
3 minutes.
15 minutes.
1 minute.
10 minutes.
8. When a tire fails, you should:
apply the brakes as hard as you can without locking the wheels.
push the brake pedal down gradually.
brake in a way that will keep your vehicle in a straight line.
stay off the brake.
9. If a vehicle is equipped with ABS, when you start the engine:
the ABS indicator light on the dash should come on and then turn off.
the trailer emergency brakes will come on.
the wheels will lock up.
the spring brakes will come on.
10. What is the minimum tread depth for tires other than front tires?
4/16 inch
4/32 inch
2/32 inch
8/32 inch
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TX Doubles Triples 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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