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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. Containerized loads are used:
when the cargo has been or will be carried by rail or ship.
when the cargo exceeds the weight limit.
when transporting liquids.
2. If you have to drive off the road, you should:
keep one set of wheels on the pavement, if possible.
brake as hard as you can to maintain control.
fully apply the brakes until your speed has dropped to about 20 mph.
3. Before driving a vehicle with a dual air system, allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
100 psi
50 psi
75 psi
4. When checking the engine compartment in a vehicle inspection, you should check all of the following except:
Windshield washer fluid level
Engine oil level
Shock absorbers
5. When the temperature drops:
bridges will not freeze.
bridges will freeze before the road will.
bridges usually freeze after other parts of the roadway.
6. On any upgrade, _________ – the more you will have to use lower gears to climb hills or mountains.
the longer the grade
the steeper the grade
All of the above.
7. In vehicles with air brakes, the air compressor governor:
controls when the air compressor will pump air into the air storage tanks.
controls when the air storage tanks will pump air into the air compressor.
controls how much air the air compressor will pump into the air storage tanks.
8. If you must stop on a one-way or divided highway, place your warning devices:
100 feet, 200 feet, and 300 feet toward the approaching traffic.
10 feet, 100 feet, and 200 feet toward the approaching traffic.
10 feet, 50 feet, and 150 feet toward the approaching traffic.
9. Combination vehicles have __ air lines.
10. Your vehicle should be equipped with all of the following except:
Spare electrical fuses
Instructions on how to perform a vehicle inspection test
Warning devices for parked vehicles
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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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