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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 Florida doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The FL CDL doubles triples test covers the following sections of the Florida CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this FL CDL practice test now to prepare for the actual test!
1. Most heavy trucks with manual transmissions require ____ to change gears.
double clutching
single clutching
triple clutching
None of the above.
2. If your trailer starts to skid, you should:
steer in the opposite direction.
release the brakes.
pump the brakes.
lock the brakes.
3. To prevent a rollover, the driver should:
drive slowly around corners, on ramps, and off ramps.
drive on the shoulder if possible.
make quick lane changes if possible.
pay extra attention to the coolant level.
4. In newer vehicles with air brakes, you put on the parking brake:
using a P-shaped, yellow control knob.
moving the orange push-pull lever to the right.
using a diamond-shaped, yellow, push-pull control knob.
placing the transmission in Park.
5. "Bobtail" tractors are:
tractors with a tank.
heavily loaded trailers.
tractors with two trailers.
tractors without semitrailers.
6. You should flash your brake lights to warn drivers behind you when:
you see a hazard that will require slowing down.
you see a bus stops in the roadway ahead to unload passengers.
you see you'll need to slow down.
All of the above.
7. Which of the following is a good way to avoid becoming an aggressive driver?
Avoid talking on your cell phone.
Keep your following distance reasonable.
Be realistic about your travel time.
All of the above.
8. When the wheels of a trailer lock up:
the vehicle will gradually come to a complete stop.
ABS will increase stopping power.
the trailer will tend to swing around.
All of the above.
9. When driving, you should check mirrors regularly to know where other vehicles are around you. Remember that:
every registered motor vehicle must have at least one mirror.
you should check your after the start of any trip to make sure they are properly adjusted.
there are blind spots that your mirrors cannot show you.
convex mirrors make things look larger and closer than they really are.
10. When preparing to make a right turn, you should NOT turn wide to the left as you start the turn. Why?
A following driver may try to pass you on the left.
It makes the turn harder.
Turning wide to the left can cause your vehicle to tilt.
A following driver may try to pass you on the right.
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FL CDL Doubles Triples Test

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