Instructions

Knowledge Test Class A

This license is required for driving any legal combination of vehicles, with a gross combination weight rating of 26,001 pounds or more, provided the GVWR of a trailer exceeds 10,000 pounds To receive this license, applicants must pass a 50-question test. To pass, applicants must answer 40 questions correctly. Each question has three or four possible answer choices. Test questions come from the 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 A CDL are: Hazardous materials, Tank, Passenger, HazMat and Tank, Air Brakes and School bus.

Number of Question 50

Passing Score 40

1. What is reaction distance?

The distance traveled between seeing a hazard and physically hitting the brakes

The distance traveled between a hazard becoming visible and a driver seeing the hazard

The distance traveled before a driver realizes they must brake

The distance traveled between physically hitting the brake and coming to a complete stop

Reaction distance is the distance traveled between the moment you mentally recognize a hazard and when you physically hit the brakes.

2. Anti-Lock Braking Systems (ABS):

Reduce a vehicle's normal braking capacity.

Are in addition to other braking systems and do not reduce a vehicle's braking power.

Are not effective on larger vehicles.

If equipped, ABS is in addition to a vehicle's normal braking system and does not increase or decrease the braking power of any other system. ABS only activates when a vehicle's wheels are about to lock.

3. When carrying a wide load, you should:

Drive as fast as possible.

Obtain special permits and follow special rules.

Honk at other drivers to get them to move from the lane closest to you.

Drive on the shoulder.

Loads that are over-length, over-width, and/or overweight may require special permits. Drivers of such loads may be subject to special restrictions, such as only being permitted to drive at certain times.

4. What should a driver do if their vehicle hydroplanes?

Accelerate.

Use the brakes.

Release the accelerator and push in the clutch.

Take the vehicle out of gear.

If your vehicle begins to hydroplane, you should slow down by releasing the accelerator and pushing in the clutch.

5. Using an Anti-Lock Braking System (ABS):

Is required in some states.

Shortens brake response time.

Provides additional control.

An Anti-Lock Braking System (ABS) helps to provide additional control during hard braking, but does not necessarily shorten a vehicle's stopping distance.

6. Which of the following is not a sign of tire failure?

A loud sound

Vibration

Smoother steering

If you experience tire failure, you may hear the loud "bang" sound of a blowout or feel a heavy thumping or vibration in your vehicle. If steering begins to feel heavy, or if the rear of your vehicle begins to fishtail, you should stop to check your tires.

7. If braking at a speed of 55 mph while driving on dry pavement, the brake lag can add ____ to your vehicle's total stopping distance.

32 feet

15 feet

50 feet

10 feet

The total stopping distance for vehicles equipped with air brakes is made up of four factors: perception distance, reaction distance, brake lag distance, and braking distance. When braking at a speed of 55 mph while driving on dry pavement, the brake lag can add around 32 feet to a vehicle's total stopping distance.

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