Which organization is primarily responsible for regulating hazardous materials transportation in the United States?

The Department of Transportation (DOT) is the organization primarily responsible for regulating hazardous materials transportation in the United States. The DOT establishes regulations that ensure safe transportation practices for hazardous materials through various modes, including road, rail, air, and water.

The DOT's responsibilities include developing guidelines for the packaging, labeling, and handling of hazardous materials, which are essential to prevent accidents and protect public safety as well as the environment. This organization oversees the implementation of standards that govern the transport of dangerous goods, ensuring that carriers and handlers comply with regulations to minimize risks during transit.

Other organizations play important roles concerning hazardous materials, but their focus differs. The Environmental Protection Agency (EPA) primarily regulates environmental protections and waste management rather than transportation specifically. The Occupational Safety and Health Administration (OSHA) focuses on worker safety and health standards in various industries, including those handling hazardous materials, but does not directly regulate the transportation aspect. The Federal Bureau of Investigation (FBI) primarily deals with criminal investigations and national security, not the regulation of hazardous materials transportation.