The Federal Motor Carrier Safety Administration (FMCSA) is a U.S. government agency under the Department of Transportation. Its primary mission is to ensure the safety of commercial motor vehicles, which include large trucks and buses. The FMCSA develops regulations, conducts research, and provides education to improve safety on the nation's highways. The agency also oversees the licensing and training of commercial drivers, as well as the enforcement of safety standards for motor carriers. By monitoring compliance and implementing safety programs, the FMCSA aims to reduce accidents and enhance the overall safety of the transportation system in the United States.