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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 Oregon doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The OR CDL doubles triples test covers the following sections of the Oregon CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this OR CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Oregon.
1. If the engine catches fire, you should:
avoid shooting foam from the vehicle's underside.
open the hood as soon as you can.
pull into a service station and notify the emergency services.
turn off the engine as soon as you can.
2. After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.
50 miles
25 miles
two hours
20 miles
3. If you are being tailgated, you should:
turn on your taillights.
open up room in front of you.
increase your speed very gradually.
make quick changes.
4. Large vehicles take longer to stop when they are:
fully loaded.
carrying hazardous materials.
heavily loaded but not fully loaded.
5. How can you tell if a converter dollie has ABS?
There is an ABS plaque on the right side of the dolly.
There is a red lamp on the left side of the dolly.
There is a yellow lamp on the left side of the dolly.
There is an ABS system on the right side of the dolly.
6. The trailer hand valve should:
never be used to test the trailer brakes.
never be used for parking.
be used in driving.
All of the above.
7. The ABS malfunction lamp on the instrument panel is:
8. Texting is:
safer than talking on a cell phone.
safer thanĀ  engaging in conversation with a passenger.
about as safe as adjusting the radio.
the most dangerous distraction.
9. Who is responsible for inspecting the cargo?
The person who loaded and secured the cargo
The shipper
The motor carrier
The driver
10. Too little weight on the driving axles can cause:
poor visibility.
mechanical damage.
poor traction.
longer stopping distances.
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OR CDL Doubles 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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