Tankers transporting hazardous materials must be marked with the NFPA 704 Hazard Identification System, which classifies hazards into categories of flammability, health, reactivity, and specific hazards with a rating scale from 0 to 4.
Tankers used to transport hazardous materials (hazmat) must be clearly marked to indicate the potential risks associated with their contents. According to the United States Department of Transportation (DOT) and the Environmental Protection Agency (EPA), regulations require the use of the National Fire Protection Agency (NFPA) 704 Hazard Identification System.
This system includes a diamond-shaped symbol that consists of four smaller diamonds, each representing a different type of hazard: flammability (red), health (blue), reactivity (yellow), and other specific hazards (white). The diamond symbols are color-coded and provide a numerical rating from 0 to 4, signifying the severity of the hazard, where 0 indicates no hazard and 4 indicates extreme danger. This information is crucial for the safe handling and transportation of hazmat.