Directions: This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test The test consists of 20 multiple choice questions. Each question has four answer choices. To pass, the applicant must answer at least 16 questions correctly. Test questions come from the Texas Commercial Motor Vehicle Drivers Handbook. Questions come from chapters covering: Driving Safely, Air Brakes (if applicable), Combination Vehicles and Doubles and Triples. The Double/Triple endorsement can be used with the Class A CDL.

The tow bar may cause injury.
The landing gear may break.
The pintle hook may detach.
Nothing bad could happen.

In the morning.
In cold weather.
At night.
After work.

The turn should be made as tightly as possible.
The front and rear wheels move in different paths.
The rear wheels should run over the curb.
It is acceptable for street signs to be knocked over if they are too close to the road.

Apply your brakes as you steer.
Give yourself extra clearance by turning more than needed to miss the object.
Turn just enough to miss the object and avoid turning more.
Steer and accelerate at the same time.

Accelerate.
Switch into a high gear.
Sound your horn.
Switch into a low gear.

Texas CDL Permit Test - Double

If you don't pull the dolly out from beneath the rear trailer before unlocking the pintle hook:

Most drivers are the least alert:

When a combination vehicle goes around a corner:

When turning quickly to avoid an object in the roadway, you should:

Before starting down a hill, be sure to:

What can happen if a parking brake is used in very wet weather when temperatures are below freezing?

The service air line is attached to the:

Number of questions:	20
Passing score:	16

Relay valves.
Supply line.
Emergency air line.
Steering wheel.