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This license is required for driving a single vehicle with a GVWR of more than 26,001 pounds, and a trailer not to exceed 10,000 pounds gross vehicle weight rating, or a vehicle designed to transport 24 or more people (including the..

This license is required for driving a single vehicle with a GVWR of more than 26,001 pounds, and a trailer not to exceed 10,000 pounds gross vehicle weight rating, or a vehicle designed to transport 24 or more people (including the driver). To receive this license, applicants must pass a 50-question test. To pass, applicants must answer 40 questions correctly. Each question has four possible answer choices. Test questions come from the Washington D.C. Commercial Driver License Manual. Questions come from chapters covering: Introduction, Driving Safely, Transporting Cargo Safely, Air Brakes (if applicable), Pre-Trip Vehicle Inspection Test, Basic Vehicle Control Skills Test and On-Road Driving.. Endorsements that may be used with a Class B CDL are: Hazardous materials, Tank, Passenger, HazMat and Tank, Air Brakes and School bus.

Passing grade:

When a tire goes flat, you may hear a loud bang. The truck will be affected:

Explanation
There may be a delay of a few seconds between the sound of a tire failing and the time that the vehicle is affected by the tire failure. Because of the short delay, a driver may initially believe that the sound came from another vehicle.

If you are turning left and there are two available left turn lanes, which lane should you choose?

Explanation
A large vehicle may need to swing right to make a left turn. If an intersection has two left turn lanes, the driver should choose the righthand land to begin their turn.

When changing lanes, you should:

Explanation
Always change lanes slowly and smoothly. If there is a vehicle in the other lane that you did not see before beginning to move, they will have more time to react to your vehicle.

If confronted by an aggressive driver, you should:

Explanation
If you encounter an aggressive driver, the most important thing to do is get out of their way, if possible. Do not provoke the driver by challenging them or making eye contact, and do not let yourself be provoked by rude gestures they might make.

A header board is used to:

Explanation
Front-end header boards, also known as "headache racks," protect drivers from moving cargo in the event of a crash or emergency stop.

A cargo cover that flaps while you are driving:

Explanation
If cargo is covered, the cover should not flap in the wind in transit. The cover could tear loose, uncovering the cargo while potentially blocking your view or the view of others.

During a vehicle inspection, ensure that the landing gear is:

Explanation
When inspecting a trailer during a vehicle inspection test, ensure that its landing gear has no missing parts and that it is fully raised. The crank handle should be secure and the support frame should not be damaged.
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