Placards must be placed on the outside of vehicles carrying hazardous materials. They identify the specific class or classes of materials being carried and warn others of relevant hazards.

When a vehicle is traveling on a downward slope, the force of gravity will cause its speed to increase.

If you are not sure which kind of extinguisher should be used on a fire in your vehicle, particularly a hazardous materials fire, you should wait for the firefighters to arrive and allow them to extinguish it.

If you must stop on the side of the road, make sure to use your four-way emergency flashers. This is particularly important at night.

Your vehicle's horn is a tool to warn others of your presence. Because the horn may create danger by startling other drivers, you should use it only if necessary.

A bus that is disabled while passengers are on board should not be towed or pushed, unless it is absolutely necessary. If needed, the bus should be towed or pushed only as far as the nearest safe location for the passengers to be discharged.

If a passenger is drunk and disruptive, you are still responsible for their safety. They should be discharged in a safe location, which may be the next scheduled stop or another well-lit area where other people are present.

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.

You should always make sure that your vehicle will be able to stop within the area of the road that you are able to see. This means that you must slow down whenever conditions reduce visibility.

Mandatory emergency equipment includes: at least one fire extinguisher; spare electrical fuses (unless the vehicle is equipped with circuit breakers); and warning devices for parked vehicles (such as reflective triangles).

While regular mirror checks should always be part of your driving routine, you should make a particular point of checking the mirrors when changing lanes, turning, merging, or making tight maneuvers.

Before adding coolant to a system without a recovery or overflow tank, you must turn the engine off and wait until it cools. Use gloves or a thick cloth to protect your hands. To release the pressure seal, turn the radiator cap slowly to the first stop.

Cargo inside a trailer must be secured appropriately to prevent it from shifting in transit.

Bridges usually freeze before the rest of the road. You should be especially careful when crossing bridges if the temperature is near the freezing point.

If a trailer is attached to a tractor, the adjustment of the vehicle's mirrors can only be checked accurately if the trailer is straight.

A bus driver should not allow passengers to bring common hazards, such as gasoline or car batteries, onto their bus.

At the end of each day of driving, you may be required to make a written report on the vehicle or vehicles driven. Be sure to make note of any issues that could affect the safety of the vehicle or that could lead to a mechanical breakdown.

In low temperatures, bridges usually freeze before other road surfaces. When driving in cold weather, especially when weather conditions have been wet, use special caution on bridges and overpasses.

When driving, you should regularly check your mirrors, both to be aware of traffic and to check for problems on your own vehicle.

If a heavy load prevents your vehicle from keeping up with the speed of other traffic, you should stay in the right lane.