Hazardous Materials should be loaded, when possible, in the tail-end of the trailer or container to permit their removal in case of fire or emergency. Distribute packages and weight evenly within the container or trailer. Use only strong, suitable and compatible blocking, bracing and dunnaging materials. Do not leave screws, nails or fasteners exposed. The first label listed is the primary hazard class.
Subsequent labels are subsidiary risks.
Placards closely resemble the shape, color, and design of the DOT primary and subsidiary risk labels. Like subsidiary risk labels, subsidiary risk placards do not have the class number or division in the bottom corner. Placards should be applied on a flat even surface, away from appurtenances like locking devices, corner posts, fittings, plates, etc. Subsidiary risk placards should be applied lower and adjacent to the primary risk placards. Certain commodities do not require placards.