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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 Illinois doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The IL CDL doubles triples test covers the following sections of the Illinois CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this IL CDL practice test now to prepare for the actual test!
1. Combination vehicles usually require _________ single commercial vehicles.
less driving skill than
the same level of skill as
more driving skill than
None of the above.
2. When conducting a pre-trip inspection:
you should review the last vehicle inspection report.
the inspection report should only be reviewed if you will be carrying passengers.
the vehicle inspection report should not be reviewed unless your supervisor tells you to do so.
None of the above.
3. To prevent rollover, you should:
turn the engine off while turning.
drive in the left lane.
drive on the shoulder of the road when possible.
drive slowly around corners.
4. You should NOT use the parking brakes if:
the brakes are very hot.
the brakes are too dry.
the brakes are cold.
All of the above.
5. To reduce driver distraction, you should do all of the following except:
Eat while driving.
Adjust mirrors before driving
Pre-program radio stations
Plan your route before driving
6. When you back under a trailer:
use lowest reverse gear.
make sure the trailer brakes are locked.
back the tractor slowly.
All of the above.
7. The safety valve is usually set to open at:
75 psi.
150 psi.
200 psi.
100 psi.
8. If the drive wheels start to skid:
use the brakes to slow down.
accelerate slightly to regain control.
push in the clutch to let them turn freely.
All of the above.
9. Which of the following is a good way to avoid becoming an aggressive driver?
Keep your following distance reasonable.
Be realistic about your travel time.
Avoid talking on your cell phone.
All of the above.
10. It's very important to distribute the cargo so it is:
as low as possible.
in the centre of the load.
as high up as possible.
piled up.
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IL CDL Doubles Triples Test

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