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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 Idaho doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The ID CDL doubles triples test covers the following sections of the Idaho CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this ID CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Idaho.
1. When your vehicle starts to skid, you must take action to:
use controlled braking.
accelerate and countersteer.
restore traction to the tires.
2. You have two tie-downs on a 15 foot load. How many more tie-downs do you need to secure cargo and keep it from shifting or falling?
3. 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 springs to put on the brakes.
the trailer emergency brakes to come on.
4. The posted speed limit for a curve:
is safe for trucks or buses, but it may be too fast for cars.
is safe for all vehicles.
may be too fast for many trucks or buses.
5. To reduce driver distraction, you should do all of the following except:
Eat while driving.
Pre-program radio stations
Plan your route before driving
6. When parked on the side of the road, you should:
use the 4-way emergency flashers.
flash your brake lights.
turn off all lights.
7. Exhaust system parts should NOT:
rub against fuel system parts.
rub against tires.
All of the above.
8. If you are feeling sleepy, you should:
increase your speed to get to the destination quicker.
slow down and drive on the shoulder of the road.
pull off the road and rest or take a nap.
9. Front-end header boards:
should never be used.
protect drivers from cargo in case of an accident or emergency stop.
protect drivers from spilled cargo.
10. Your mirrors should be adjusted so that:
the rear of the vehicle is visible in the mirror.
no part of the vehicle is visible in the mirror.
a part of the vehicle is visible in the mirror.
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ID Doubles Triples Test

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