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Hazardous materials placards correspond very closely with the shape, color, and design of hazardous materials labels. However, placards are much larger than labels. Placards alert persons to the potential dangers associated with the particular hazardous material contained in a motor vehicle, rail car, freight container, cargo tanks, and portable tanks.
Anyone offering or accepting hazardous materials for shipment in an amount that requires placards must ensure the material is placarded according to the applicable sections of the Hazardous Materials Regulations (HMR).
The responsibility for affixing or supplying placards varies according to the mode of transport and the type of packaging used to transport the hazardous material.
Placards may be displayed for a hazardous material, even when not required, if the placarding conforms to the regulations.
Placarding requirements vary according to the category of the material (hazard class, division, packing group, or description) being transported and the type of packaging (bulk or non-bulk) containing the material. Table 1 and Table 2 must be referred to when determining placarding requirements.Placards must meet certain specifications for durability, design, size, and color.
Placard placement varies depending on the packaging size or vehicle being used.