HAZMAT is any substance or material that the Secretary of Transportation has determined is capable of posing an unreasonable risk to health, safety, or property when transported in commerce. The Secretary of Transportation designates HAZMAT under the Hazardous Materials Transportation Act and its implementing regulations. Within the federal government, DOT has the primary responsibility to issue regulations for the safe transport of HAZMAT in intrastate, interstate, and foreign commerce. To accomplish this mission, DOT issues HAZMAT regulations and provides other services to the transportation community and emergency responders-such as training, enforcement, technical support, information, and policy guidance-to protect the public against the safety risks inherent in transporting HAZMAT.