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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. When more cargo is piled up in a truck, the center of gravity moves:
closer to the ground.
higher up from the road.
to the left side of the truck.
2. If an item placed on a flatbed trailer is 7 feet long, it should have __ tie-downs.
3. Why should you cover your cargo?
To protect the cargo from weather.
To protect people from spilled cargo.
All of the above.
4. When driving a 60-foot truck at 50 mph, your minimum following distance should be:
7 seconds
6 seconds
5 seconds
5. You are driving a double. Before entering traffic, you should:
assume there is enough room to merge into traffic.
make sure you have a large enough gap before entering or crossing traffic.
turn on your headlights.
6. The posted speed for a curve that may be safe for a straight truck:
can be ignored when driving a double or triple.
is likely to be safe for a double or triple.
could be too fast for a double or triple.
7. Enough tread is especially important in winter conditions. You need at least ________ tread depth on steering axle tires.
6/24 inch
4/32 inch
2/8 inch
8. When backing, you should:
back quickly.
avoid using the mirrors.
use a helper if possible.
9. Combination vehicles usually:
are shorter than single than single CMVs.
require more driving skill than single CMVs.
are easier to drive than single than single CMVs.
10. When inspecting the coupling, how much space should there be between the upper and the lower fifth-wheel?
It depends on the trailer
½ inch
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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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