A vehicle being equipped with anti-lock brakes on only the tractor or only the trailer provides additional control during braking.

The stab braking method for emergency stops involves fully applying the brakes until they lock up. The brakes are then released until the wheels start rolling, and then the process is repeated.

All commercial motor vehicles are required to be equipped with the proper emergency equipment. This may include spare electrical fuses; three red reflective triangles, six fuses, or three liquid burning flares; and at least one properly charged and rated fire extinguisher. Optional equipment includes tire chains, tire changing equipment, a list of emergency phone numbers, and an accident reporting kit/packet.

In vehicles equipped with an automatic tractor protection valve, the valve will pop out if air pressure drops to a level between 20 and 45 psi. When the valve pops out, the protection valve will close, stopping the flow of air.

The emergency air line controls the emergency brakes on a combination vehicle. A loss of air pressure in the emergency line will cause the emergency trailer brakes to activate.

Speeding is the leading cause of death and injury in work zones. Use extra caution when driving near workers in a work zone.

Because of the risks presented by the nature of the materials, government on federal, state, and local levels may impose regulations on the transportation of hazardous materials.

A shipping paper describes hazardous materials being transported. Shipping orders, bills of lading, and manifests are all shipping papers.

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 you discover that a cargo of hazardous materials is leaking from your vehicle, you should park the vehicle as soon as possible. The longer you continue driving, the longer the trail of contamination becomes. While this creates potential danger and harm to others, it also increases clean-up expenses.

The suspension system performs the vital functions of holding up the vehicle and its load while keeping the axles in place. Defects in the suspension are therefore extremely dangerous.

Wheels or rims that have had welding repairs are not safe for use. They should be replaced before the vehicle is taken on the road.

Distractions that can affect safe driving can be classified as physical (such as reaching for an object), mental (such as talking with passenger), or both (such as talking on a hand-held phone).

If a package of hazardous materials is not large enough to display the proper label, the label may be placed on a tag that is securely attached to the package.

While hazardous materials are being transported, shipping papers should either be kept in a pouch in the driver's side door or in another location where the driver is able to easily reach them while their seat belt is fastened. The papers must be clearly visible to anyone who is entering the cab.

A rollover is more likely if cargo is unevenly loaded in a rig. To help prevent a dangerous rollover, it is important to keep a load as centered on the rig as possible.

In the event of tire failure, hold the steering wheel firmly. Stay off the brakes and let the vehicle slow down on its own. Once the vehicle has slowed considerably, you should brake very gently, pull off the road, and stop. Check your tires after coming to a complete stop.

When turning on your vehicle's engine, the lights on the dash should come on and then turn off. If the ABS malfunction light stays on, the system is not working properly. In the case of a truck with a trailer, if the yellow light on the left rear of the trailer stays on once the engine has been started, the system is not working properly.

Keep weight distribution in mind when loading cargo into a trailer or tank. When loading a tank that is divided by bulkheads into multiple smaller tanks, you should not place too much weight in the front or rear of the tank.

Warning signs that a driver may be impaired include that they are having trouble staying in their lane, they are having trouble maintaining an appropriate driving speed, or they are stopping without a clear reason.