Louisiana CDL DMV Knowledge Test Class B 2

If your mirrors or wiper blades become icy while you are driving, you can expect the road surface to be icy as well.

If the low air pressure warning signal comes on while you are driving a vehicle with air brakes, you should immediately bring the vehicle to a safe stop while you are still able to control the brakes. Inspect and repair the brakes as soon as possible.

To keep an engine fire from spreading, you should turn off the vehicle's engine as soon as possible. Do not open the hood if you don't have to.

Anti-Lock Braking System (ABS) malfunction lamps are usually yellow. Even if the ABS isn't working properly, a driver will still have access to the vehicle's usual braking functions.

If you find yourself being tailgated by another driver, you should increase your following distance and avoid making quick moves. Increasing your speed may only result in the other driver continuing to tailgate you at a higher speed. Do not turn on your taillights or flash your brake lights at the other driver.

For your own safety, when placing reflective warning triangles, you should carry them between your body and the oncoming traffic.

During the vehicle inspection test, you will be asked to do a complete inspection of your vehicle. You will need to explain what you are inspecting and why.

It is best not to avoid driving in fog. However, if you must drive under foggy conditions, be sure to decrease your speed.

It is important to observe other drivers' actions and identify clues that a person could be driving impaired. Drivers who have had too much to drink, are sleepy, are on drugs, or are ill can present hazards to other drivers. One sign that a driver may be impaired is that they have their windows rolled down in cold weather.

If your vehicle begins to hydroplane, do not apply the brakes. Instead, slow down by releasing the accelerator and pushing in the clutch. This will help you to regain traction.

A steering wheel should be held firmly with both hands, placed on opposite sides of the wheel.

Skids happen when tires' traction with the road surface decreases. This can be caused by over-braking, over-accelerating, over-steering, and driving too fast.

If you experience an engine fire, you should turn off the engine as soon as safely possible. Avoid opening the vehicle's hood when extinguishing the fire.

When driving in reverse, it is always recommended that a driver backs their vehicle toward its left side. This will allow the driver the best possible view of the rear of their vehicle.

Cargo should be blocked to prevent it from sliding around in transit. The shifting of weight in transit can make steering and handling difficult for the driver.

Gross Combination Weight (GCW) is the total weight of a powered unit, its trailer(s), and the cargo being carried.

It is essential that your vehicle will be able to stop within the area of the road that you are able to see. This means that you must slow down whenever conditions reduce visibility.

While regular mirror checks should be a part of your driving routine, it is particularly important to check your mirrors when changing lanes, turning, merging, and making tight maneuvers.

Drivers who are engaged in conversation with passengers may be distracted from the task of driving. Use extra caution when driving near distracted drivers.

During a pre-trip inspection, be sure to check the mirrors and windshield for dirt and anything else that could interfere with your ability to see. Clean them as necessary.

In a vehicle with dual parking control valves, there is a separate air tank that can be used to temporarily release the spring brakes if they have been activated due to low air pressure. Pushing in the proper control will release the spring brakes for a short period of time, allowing the driver to move the vehicle in an emergency.

Always speed up smoothly and gradually so that your vehicle does not jerk. Rough acceleration can cause mechanical damage.

Cargo inside a trailer must be secured appropriately to prevent it from shifting in transit.

The person driving a vehicle is responsible for its safe operation. Be sure to perform routine vehicle inspections before operating a commercial motor vehicle.

When performing a static leakage test on a double combination vehicle with air brakes, the leakage rate should be no more than 3 psi in one minute. If the air leaks from the air brake system at a quicker rate, the vehicle should not be driven because something likely needs to be repaired.

Backing a commercial motor vehicle is always dangerous because you cannot see everything behind you. When backing, make frequent checks of the mirrors on both sides of the vehicle. Use a helper whenever possible.

Never remove the radiator cap or any part of the pressurized cooling system until it has cooled. Opening the cap while the system is too hot could release steam and boiling water that could severely burn you. If the radiator cap is cool to the touch, the system is likely cool enough for you to open the cap.

If confronted by an aggressive driver, it is most important to get out of their way, if possible. Do not make eye contact with the driver, as doing so could provoke them. Do not let them provoke you with their actions.

If your vehicle begins to hydroplane, you can regain control by releasing the accelerator and pushing in the clutch.

Brakes are designed to take a lot of heat, but drivers should not rely solely on the brakes to slow their vehicle. Brakes may fade and lose their ability to slow down the vehicle if they become too hot, so drivers should also rely on the engine braking effect.

A pre-trip vehicle inspection should be done in the same way every time. Consistency will help a driver learn all of the proper steps and decrease the possibility of the driver forgetting to inspect something.

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 the vehicle's total stopping distance.

Use your senses during trips to help you identify mechanical issues. If you see, hear, smell, or feel anything that could indicate trouble, you should stop and check it out.

When inspecting a vehicle that is equipped with power steering, check the hoses, pumps, and fluid level. In particular, you should look for leaks in the hoses.

B:C fire extinguishers are designed to work on electrical fires and burning liquids. Don't pour water on an electrical fire.