What are "Placards"?

Placards are essential visual indicators placed on vehicles or shipments containing hazardous materials. Their primary function is to alert handlers, transporters, and emergency responders to the presence of hazardous substances, thereby ensuring safety and compliance with regulations. Each placard is color-coded and features symbols or numbers that correspond to specific types of hazards, such as flammable, toxic, or corrosive materials.

This clear identification is critical in emergency situations, as it allows first responders to assess the risks associated with the materials involved quickly. The use of placards is mandated under the Hazardous Materials Regulations (HMR) to facilitate safe transport and handling of hazardous materials across different modes of transportation, ensuring that potential dangers are communicated effectively.

The other options provided do not fulfill the role or definition of placards in the context of hazardous materials transport.