Alabama CDL Knowledge Test Class A: Practice Test

If you are being tailgated, you should increase the distance between your vehicle and the vehicle ahead. This will reduce your need to make sudden moves, and will also allow the tailgater more room to pass you. Speeding up when being tailgated is not advised because it may result in the tailgater continuing to follow you closely at the higher speed, only increasing the danger.

At speeds below 40 mph, you should allow at least one second of following distance for every 10 feet of your vehicle. When traveling at higher speeds, follow the same formula, then add one additional second to your following distance.

On a downgrade, the force of gravity will cause a vehicle's speed to increase. When approaching a downgrade, choose to travel at a speed that will be safe for the size and weight of your vehicle.

Most drivers are the least alert at night, especially after midnight. Therefore, crashes due to fatigued driving are more likely at night than any other time of day.

Rust around wheel nuts may mean that they are loose. Check the tightness of the nuts if you see any rust in the area.

Gross Vehicle Weight (GVW) is defined as the total weight of a single vehicle in addition to its load.

A vehicle that is equipped with air brakes must also be equipped with a supply pressure gauge. This gauge tells the driver how much air pressure is in each of the vehicle's air tanks.

Brakes out of adjustment will fade before those that are properly adjusted. Brake adjustment must be checked frequently to help prevent brake issues.

An alcohol evaporator can help prevent ice from building up in an air brake system. In cold weather, the evaporator should be checked and refilled every day.