It is always safest to assume that other drivers, bicyclists, and pedestrians don't see you. Be prepared for the possibility that they may suddenly move into your path. It may be safe to lightly tap your horn or flash your lights as you pass.

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.

Driving in fog is always dangerous. If possible, you should always avoid driving under foggy conditions.

The service line, also called the control line or signal line, carries air to the trailer brakes and is controlled by the foot brake or trailer hand brake.

Unbaffled tanks are also often referred to as "smooth bore tanks."

Check you mirrors frequently while driving, but check them quickly. Staring at one mirror for too long can cause you to drive a long distance without knowing what is ahead.

Failure of hydraulic brakes is often caused by a loss of hydraulic pressure. Hydraulic brakes may also fade because of overuse on a long downgrade.

Some radioactive materials are required to be accompanied by a transport index. A transport index is a number that indicates how much control the material will require during transport. The total transport index of all cargo in a single vehicle may not exceed 50.

Black ice is a layer of ice that is thin and clear enough for the road to be visible through it. This makes the road look as if it is merely wet.

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.

A large vehicle may need to swing right to make a left turn. If an intersection has two left turn lanes, the driver should choose the righthand land to begin their turn.

It is a good idea to compare a shipping paper to the applicable package markings and labels. Ensure that the shipper has included the correct basic description on the shipping paper and that it matches markings and labels.

ABS increases a driver's control during braking. It will not necessarily change the distance needed for a vehicle to come to a complete stop.

Carriers and drivers must be able to quickly identify hazardous materials' shipping papers. Shipping papers for hazardous materials should be on the top of a stack of shipping papers.

Always apply the parking brake when leaving your vehicle.

If you must stop on the side of the road, it is important that you turn on your emergency flashers as a warning to other drivers. This is especially important if you are stopped at night.

In a combination vehicle with air brakes, the tractor protection valve keeps air in the tractor or truck brake system in the event of the trailer breaking away or developing a leak.

Air pressure in the service air line is controlled by either the foot brake or trailer hand brake. The service air line is also known as the control line or signal line. This line is connected to relay valves, which allow the trailer brakes to be applied more quickly than would otherwise be possible.

Texting while driving a commercial motor vehicle is both illegal and dangerous. Manually entering text into or reading text from any electronic device is considered texting.

Stopping is not always the safest option when responding to an emergency while driving. It is usually safer to steer out of the way when attempting to avoid a crash.