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

Employees who work with hazardous materials must be trained and tested at least once every three years.

Avoid being an aggressive driver by being realistic about your travel time, making allowance for delays, maintaining reasonable following distances, and not making hand gestures that could anger another driver.

Beginning between 1997 and 1999, most commercial vehicles, trailers, and dollies are required to be equipped with ABS.

While regular mirror checks should be part of your normal scanning routine, be especially sure to check your mirrors when changing lanes.

Radiation surrounds packages of radioactive materials and passes through to other nearby packages. To address this, the number of radioactive packages that can be loaded together is limited.

The service air line carries air and is controlled by either the foot brake or trailer hand brake. The service air line is attached to relay valves, which allow the trailer brakes to be applied quickly.

Tractor protection controls in older vehicles may be operated by levers instead of knobs. If an air supply control is set in its "normal" position, it is properly set for you to pull a trailer.

It is important to communicate your intentions to others on the road. Make sure to signal before turning or changing lanes, even if no other vehicles are nearby.

The securement of cargo must be checked before beginning a trip, within the first 50 miles of a trip, and then again every three hours or 150 miles.

If a hazardous materials label will not fit onto a package, it may be placed on a tag that is securely attached to the package.

Factors that can affect stopping distance include your vehicle's speed, its weight, and how slippery the road surface is.

Always downshift before beginning to drive downhill. Forcing an automatic transmission into a lower gear at a high speed could damage the transmission and also lead to a loss of ability to engine brake. Drive at a speed that will allow you to control your vehicle without overusing your brakes. When determining a safe speed to drive, you should take into account the steepness of the grade, the length of the grade, the weight of your vehicle, road conditions, and weather conditions.

When inspecting an exhaust system, you should verify that parts of the system are not loose, broken, or missing. The system's parts must be properly mounted and should not be rubbing against moving parts of the vehicle.

Be sure to test the trailer emergency brakes before beginning a trip. After ensuring that the trailer rolls freely, you can test the emergency brakes by pulling out the trailer air supply control, or placing it in the "emergency" position. Pull forward slightly with the tractor and make sure the trailer does not move.

When driving at dawn, at dusk, or in inclement weather, you should use your headlights on their low beam setting to increase your visibility.

Gross Combination Weight (GCW) is the total weight of a powered unit, its trailer(s), and the cargo being carried.

Your vehicle pulling to one side or the other while you are braking can indicate trouble with the brakes.

Overuse of the brakes may cause them to overheat, making them less effective. This is known as "fade."

If you are transporting hazardous waste, you must carry with you a Uniform Hazardous Waste Manifest. The manifest must be signed by hand.