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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. You are more at risk of being fatigued:
when driving alone.
when driving during the day.
after getting more than 8 hours of sleep.
when stopping periodically during long trips.
2. If a trailer does not have spring brakes, to keep the trailer from moving you should:
park on a slight decline.
use the service brakes.
use wheel chocks.
close the brake valve.
3. Which of the the following statements about fatigue is true?
Fatigued driving is one of the leading causes of accidents.
Fatigue may cause you to not see and react to hazards.
Fatigue impairs your vision and judgment.
All of the above.
4. Which of the following vehicles is most likely to turn over?
Triple trailer
3 axle tractor semitrailer
65 ft. conventional double
5 axle tractor semitrailer
5. To prevent rollover, you should do all of the following except:
drive slowly around turns.
avoid quick lane changes.
put the lightest parts of the cargo under the heaviest parts.
keep the load centered on your rig.
6. To know how much space you should keep in front of you:
estimate how many seconds it would take you to reach the vehicle ahead.
estimate how many vehicle lengths there are between you and the vehicle ahead.
wait until the vehicle ahead of you passes a clear landmark, then count off the seconds until you reach the same spot.
None of the above.
7. If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:
the vehicle to slide back and forth.
the trailer emergency brakes to come on.
the springs to put on the brakes.
the trailer supply valve to open.
8. When driving in heavy traffic, the safest speed is:
faster than the other vehicles.
the same speed as the other vehicles.
slower than the other vehicles.
half the speed of the other vehicles.
9. During a walk around inspection of a double or triple trailer, make sure that the converter dolly air tank drain valve is _____ and the glad hands are ______.
closed; not connected
open; not connected
open; properly connected
closed; properly connected
10. To know how much space you should keep in front of you when driving at speeds below 40 mph, one good rule says you need at least ______ for each ______ of vehicle length.
3 seconds; 50 feet
1 second; 10 feet
2 seconds; 10 feet
1 second; 5 feet
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OR 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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