Section 5.1 - Applicability(a) This part prescribes general procedures that apply to rulemakings of the U.S. Department of Transportation (the Department or DOT), including each of its operating administrations (OAs) and all components of the Office of Secretary of Transportation (OST).(b) For purposes of this part, Administrative Procedure Act (APA) is the Federal statute, codified in scattered sections of chapters 5 and 7 of title 5, United States Code, that governs procedures for agency rulemaking and adjudication and provides for judicial review of final agency actions.