摘要: |
PHMSA is the lead agency responsible for regulating the safe transport of hazardous materials, including explosive, poisonous, corrosive, flammable, and radioactive substances. PHMSA regulates up to 1 million daily movements of hazardous materials, totaling up to 20 percent of all freight tonnage shipped each year in the United States. The FAA, Federal Motor Carrier Safety Administration (FMCSA), and Federal Railroad Administration (FRA) also oversee and enforce regulations for their respective industries. Many hazardous materials are transported under the terms and conditions of special permits and approvals. Special permits and approvals allow a company or individual to transport, package, or ship hazardous materials in a manner that varies from the regulations, provided they meet two key criteria for authorization. |