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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 Ohio doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The OH CDL doubles triples test covers the following sections of the Ohio CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this OH CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Ohio.
1. If you go twice as fast, your stopping distance will increase by:
four times.
two times.
eight times.
2. Emergency brakes must be held on by:
hydraulic pressure.
mechanical force.
air pressure.
3. The safety valve installed in the first tank the air compressor pumps air is set to open:
if there is too little pressure.
if there is too much pressure.
at 30 psi.
4. Under a pressurized system, the radiator cap:
should never be hot.
should be removed when the coolant is hot.
should never be removed until the system has cooled.
5. ABS helps you:
keep the wheels from locking up.
decrease your average speed.
lock your wheels.
6. You should be especially alert for drunk drivers:
late at night.
in the morning.
around shopping areas.
7. The weight of a truck:
has no effect on stopping distance.
has an impact on stopping distance.
is not as important as the vehicle's center of gravity in determining stopping distance.
8. For safe handling, the heaviest trailer should be:
the second trailer in a triple.
the last trailer.
behind the tractor.
9. Over-length loads:
may require special equipment such as "wide load" or flags.
require special transit permits.
All of the above.
10. When driving double and triple trailers, drivers should:
allow more following distance.
steer gently and go slowly around corners.
All of the above.
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OH CDL Doubles Triples Test

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