It is the regulatory body responsible for regulating trucking at a national level. They define commercial motor vehicles as any vehicle with a gross weight rating above 10,000 pounds. This includes cargo, passengers, and drivers. The Federal Motor Carrier Safety Administration (FMCSA) is a United States Department of Transportation (DOT) agency. Its primary mission is to reduce commercial motor vehicle-related deaths and injuries. It works with a variety of federal, state, and local agencies to enforce regulations.