Regulatory Bodies
US Department of Transportation regulating road, aviation, and rail transport.
DOT (Department of Transportation) is the US federal department regulating road transport (FMCSA), aviation (FAA), rail (FRA), and traffic safety (NHTSA). For truck fleets, FMCSA defines hours of service (HOS), the mandatory electronic logging device (ELD), and DOT-number registration. Site: transportation.gov.