New Jersey CDL DMV Knowledge Test Class A 2

A low air pressure warning signal is required in vehicles with air brakes. The warning light is usually red and may be accompanied by a buzzer.

The most common type of foundation brake is an s-cam drum brake.

Before slowing down, it is a good idea to flash your brake lights by lightly tapping your brake pedal a few times. This will warn drivers behind you of your plans to slow down.

Dry bulk tanks require special care when being driven because they have high centers of gravity. Drivers should also be careful because the materials being carried can easily shift in transit, causing a change in the vehicle's handling.

A vehicle's headlights should be clean during trips. This will ensure that the lights can provide as much light as possible, helping the vehicle to be seen.

Driving with a dry bulk tank requires special care, both because dry bulk tanks have high centers of gravity and because their loads often shift in transit. Be especially careful when taking turns and curves while operating such a vehicle.

Tractors, trucks, and buses with Anti-Lock Braking Systems (ABS) have yellow malfunction lamps located on their instrument panels. Trailers have yellow ABS malfunction lamps on their left side, either on the front or rear corner.

In work zones, you should observe posted speed limits. Slow down if road or weather conditions are poor, and slow down even further if workers are near the roadway.

Trailers equipped with Anti-Lock Braking Systems (ABS) are equipped on the left rear with a yellow malfunction lamp. If the malfunction lamp stays on after the engine has been started, the ABS is malfunctioning.

Always signal before a turn or lane change. Begin signaling well in advance of the movement and keep the signal on continuously during the turn. If it is not self-canceling, make sure to turn your signal off after your turn or lane change is complete.

In conditions of poor visibility (such as at dawn, at dusk, in rain, or in snow), you should turn on your low beam headlights to make your vehicle easier to see. Do not use your high beams when driving near other vehicles.

An Anti-Lock Braking System (ABS) is in place as an addition to a braking system. It intervenes to prevent brakes from locking up during hard braking. If ABS is not working, the basic braking functions on a vehicle will still remain, so the driver can continue to drive and brake normally.

If your vehicle gets stuck on railroad tracks for any reason, you should immediately exit the vehicle and walk away from the tracks. Contact the proper emergency authorities.

You must have a CDL with a HazMat endorsement to operate a vehicle that is used to transport hazardous materials.

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.

Having tires of mismatched sizes on a vehicle is a problem that should be fixed if discovered during a vehicle inspection.

You will be denied a hazardous materials endorsement, or lose an existing endorsement, if you renounce your U.S. citizenship; are not a lawful permanent U.S. resident; are wanted for, indicted for, or convicted of certain felonies; are judged mentally defective or are committed to a mental institution; or are deemed by the Transportation Security Administration (TSA) to pose a security threat.

Black ice is a thin layer of ice that is clear enough for the road surface to be seen through it. A road covered in black ice may look like it is merely wet. You should be very careful when temperatures are below freezing and the road looks wet.

For some vehicles, you may need to leave the engine running to be able to check its automatic transmission fluid level.

Gross Vehicle Weight (GVW) is the total weight of a single vehicle and its load of cargo.

If a vehicle carries red reflective triangles, the driver should place three of them as warning devices when the vehicle is parked on the road.

During the basic vehicle control skills test, you must place the vehicle in neutral and set the parking brake before exiting the vehicle to check its position. You may check the position of the vehicle no more than twice, except during the straight line backing exercise, where you may look no more than once.

After starting a vehicle's engine, the oil pressure should come up to a normal level within seconds. Do not operate a vehicle if it has oil pressure that is low, dropping, or fluctuating.

Convex mirrors are curved to provide drivers with wider views of the road than can be provided by flat mirrors. However, convex mirrors also make objects appear to be smaller and farther away than they really are.

To test a parking brake, you should fasten your safety belt, set the parking brake for the power unit, release the trailer parking brake (if applicable), place the vehicle in low gear, and attempt to pull forward against the parking brake. If the parking brake does not hold while you are attempting to pull forward against it, the brake is faulty and must be fixed.

Regrooved, recapped, or retreaded tires are not allowed to be used on the front wheels of a bus.

If you must stop on the side of the road, you should turn on your emergency flashers to alert other road users. This is particularly important at night.

On flatbed trailers and trailers without sides, cargo must be securely tied down to keep it from shifting or falling off in transit.

During a pre-trip inspection, belts in the engine compartment should be checked for tightness and excessive wear.

The service brake system applies and releases the brakes when a driver presses the brake pedal while driving normally.

To stop normally in a vehicle with air brakes, press down the brake pedal.

If you double your speed, your braking distance will become four times longer. Similarly, the impact your vehicle would have in the case of a collision will also multiply by four.

The added weight of a heavy load will make a vehicle sit lower than usual. A vehicle will often be taller when carrying a light load than when carrying a heavy load. If your vehicle fits under an overpass while carrying a full load, it is not guaranteed that it will fit under the same overpass if it is empty.

Using the brakes after a tire failure could cause you to lose control of your vehicle. Unless you're about to hit something, stay off of the brake until the vehicle has slowed sufficiently.

You should never rely only on warning signals to alert you to an approaching train. Never try to race a train to a crossing. If there are multiple tracks at a crossing, be sure to check all tracks in both directions before starting to cross.