A number of the CFR’s signage requirements relate to the transportation of materials to and from mines. On powder chests (§56.6133) and magazines that hold explosives (§56.6132), for instance, regulation mandates the usage of Department of Transportation (DOT) placards. These placards indicate the hazards associated with the contents of the powder chests and magazines, such as flammability and explosiveness, as outlined in Title 49
of the CFR. This serves to keep everyone around the materials safe. When hazardous materials are actually transported to or from the mine, the vehicles must be posted with warning signs that indicate the vehicle’s contents, These signs must be visible from every approachable direction (§56.6202).
Railroad crossing signs are mandatory at mines to indicate the intersection of two railroads.