DOT Rules by Agency Explained
Matthew Gray
December 13, 2025
FMCSA, FAA, FRA, FTA, PHMSA, and USCG in One Practical Guide. The U.S. Department of Transportation does not operate under one single safety rulebook. Instead, DOT oversees six separate federal agencies, each responsible for a specific transportation sector. Every one of these agencies enforces mandatory drug and alcohol testing, along with operational safety regulations, but