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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 Oklahoma doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The OK CDL doubles triples test covers the following sections of the Oklahoma CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this OK CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Oklahoma.
1. Placards are:
signs put inside a vehicle used to warn others of hazardous materials.
devices placed below a vehicle to improve traction.
signs placed on a vehicle to identify the hazard class of the cargo.
2. If you are feeling sleepy, you should:
pull off the road and rest or take a nap.
increase your speed to get to the destination quicker.
slow down and drive on the shoulder of the road.
3. Empty trucks:
may have poor traction.
require shorter stopping distances than fully-loaded trucks.
have better traction than fully-loaded trucks.
4. If a load is placed on one side of the trailer:
the steering axle weight will be too light to steer safely.
a rollover is more likely.
making turns may be easier.
5. If a vehicle is equipped with ABS, when you start the engine:
the wheels will lock up.
the ABS indicator light on the dash should come on and then turn off.
the spring brakes will come on.
6. To warn drivers behind you when you see you'll need to slow down, you should:
sound your horn.
use your headlights.
flash the brake lights.
7. Hanging meat in a refrigerated truck:
can be a very unstable load.
will not affect safe driving ability.
should never be transported.
8. When a combination vehicle goes around a corner:
the driver must keep the rear of your vehicle far away from the curb.
the rear wheels of the trailer will never off-track.
the front and rear wheels follow a different path.
9. Enough tread is especially important in winter conditions. You need at least ________ tread depth on steering axle tires.
4/32 inch
6/24 inch
2/8 inch
10. When driving a 50-foot truck at 40 mph, your minimum following distance should be:
6 seconds
4 seconds
5 seconds
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OK CDL 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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