Which agency requires placards on vehicles that transport certain types and quantities of hazardous materials?

• A. U.S. Department of Transportation
• B. Environmental Protection Agency
• C. Food and Drug Administration
• D. National Oceanic and Atmospheric Administration

Answer: (A)

Hazardous materials in transit must be clearly identified so everyone nearby knows what they’re dealing with in an accident or spill. The agency that requires placards on vehicles carrying certain hazardous materials is the U.S. Department of Transportation. This rule comes from the federal Hazardous Materials Regulations, which are administered by PHMSA within DOT. The placards convey the hazard class of the material and help emergency responders, other drivers, and responders quickly assess the risk and respond appropriately. Placards are required when the material is hazardous and the quantity meets regulatory thresholds, and they apply across different modes of transport (truck, rail, vessel, and aircraft). The Environmental Protection Agency, the Food and Drug Administration, and the National Oceanic and Atmospheric Administration handle environmental protection, product safety, and weather/oceanography, respectively, but they do not set these transportation placarding requirements.