This Cabinet-level department covers all areas of transportation and all modes of transport – truck, bus, rail, maritime, air, pipeline, transit. Under its umbrella, the DOT has regulatory agencies, which set the federal rules for each mode of transportation and for the building and maintenance of transportation infrastructure – roads, bridges, tracks, pipelines, ports, airports. The phrase “DOT-regulated” is a catchall term for rules issued by one of the DOT’s regulatory agencies. Trucking commonly deals with the Federal Motor Carrier Safety Administration (FMCSA), the National Highway Traffic Safety Administration (NHTSA), and, for hazardous materials carriers, the Pipeline and Hazardous Materials Safety Administration (PHMSA). Trucking relies on the roads and bridges whose construction and maintenance are overseen by the Federal Highway Administration (FHWA).