Alabama CDL Knowledge Test Class A: Practice Test

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.

In an air brake system, a low pressure warning signal should activate if the pressure in the air tanks falls to a level below 60 psi. This signal may be in the form of a warning light or a wig wag.

In some emergencies, the best strategy for avoiding a hazard may be to drive onto the shoulder. Most shoulders are strong enough to support the weight of a large vehicle.

If you see, hear, smell, or feel anything that could indicate trouble while you are driving, you should stop and inspect the source of the unusual occurrence.

In a newer vehicle with air brakes, the parking brake is controlled by a diamond-shaped yellow knob. The knob is pulled out to apply the parking brakes and pushed in to release them.

Weight of cargo should be loaded into a trailer as low as possible. If the weight of cargo is positioned too high in a trailer, it will put the vehicle at risk of tipping over.

When driving, you should continually scan the road for possible hazards. Form plans about what you will do if the hazards develop into emergencies.

If the coolant temperature gauge goes above the highest safe temperature, you should stop driving as soon as possible and try to figure out what is wrong. There could be an issue in your vehicle that could lead to engine failure and possibly a fire.

Good drivers look down the road at least 12 to 15 seconds ahead of their vehicles. This makes it possible to identify hazards early, when drivers are more likely to have time to respond appropriately.