Placards are used to warn others of hazardous materials. Placards are signs put on the outside of a vehicle that identify the hazard class of the cargo. A placarded vehicle must have at least four identical placards. They are put on the front, rear, and both sides.

What is the reason that placards are used?

Why are DOT placards important? They inform the public - dangerous goods are regulated in transportation because they pose an increased safety risk to property and the public. Placards warn the people of the presence of hazards while they're driving or near large quantities of hazmat being transported.

What is a placard and when is it used?

A placard is a dangerous goods safety mark that is displayed on a large means of containment (MOC). It is used to identify dangerous goods and to show the nature of the danger they pose.