49 CFR Part 1500 — Applicability, Terms, and Abbreviations

PART 1500—APPLICABILITY, TERMS, AND ABBREVIATIONS Authority: 49 U.S.C. 114, 5103, 40113, 44901-44907, 44913-44914, 44916-44918, 44935-44936, 44939, 44942, 46105; Pub. L. 110-53 (121 Stat. 266, Aug. 3, 2007) secs. 1408 (6 U.S.C. 1137), 1501 (6 U.S.C. 1151), 1517 (6 U.S.C. 1167), and 1534 (6 U.S.C. 1184). Source: 67 FR 8351, Feb. 22, 2002, unless otherwise noted. § 1500.1 Applicability. This chapter, this subchapter, and this part apply to all matters regulated by the Transportation Security Administration. § 1500.3 Terms and abbreviations used in this chapter. As used in this chapter: Administrator Alien Authorized representative Bus Bus transit system Citizen of the United States U.S. Citizen et seq. Commuter bus system Commuter passenger train service Day DHS DOT Fixed-route service General railroad system of transportation Hazardous material Heavy rail transit Host railroad Improvised explosive device (IED) Intercity passenger train service Lawful permanent resident Light rail transit Motor vehicle National of the United States U.S. national (1) A citizen of the United States; or (2) A person who, though not a citizen of the United States, owes permanent allegiance to the United States, as defined in 8 U.S.C. 1101(a)(22). Over-the-Road Bus (OTRB) Owner/operator Passenger rail car Passenger railroad carrier Passenger train Person Private rail car Public transportation (1) Intercity or commuter passenger train service or other short-haul railroad passenger service in a metropolitan or suburban area (as described by 49 U.S.C. 20102(1)). (2) Heavy or light rail transit service, whether on or off the general railroad system of transportation. (3) An automated guideway, cable car, inclined plane, funicular, or monorail system. (4) Bus transit or commuter bus service. Public transportation agency Rail hazardous materials receiver Rail hazardous materials shipper Rail secure area Rail transit facility Rail transit system or “Rail Fixed Guideway System” Railroad carrier Railroad transportation (1) Any form of non-highway ground transportation that runs on rails or electromagnetic guideways, including: (i) Commuter or other short-haul rail passenger service in a metropolitan or suburban area; and (ii) High speed ground transportation systems that connect metropolitan areas, without regard to whether these systems use new technologies not associated with traditional railroads. (2) Such term includes rail transit service operating on track that is part of the general railroad system of transportation but does not include rapid transit operations in an urban area that are not connected to the general railroad system of transportation. Record Sensitive security information (SSI) State Tourist, scenic, historic, or excursion operation Transit Transportation transport Transportation facility Transportation security equipment and systems Transportation Security Regulations (TSR) Transportation Security-Sensitive Material (TSSM) TSA United States, Vulnerability assessment [85 FR 16497, Mar. 23, 2020, as amended at 89 FR 35625, May 1, 2024; 91 FR 7161, Feb. 17, 2026] § 1500.5 Rules of construction. (a) In this chapter, unless the context requires otherwise: (1) Words importing the singular include the plural. (2) Words importing the plural include the singular. (3) Words importing the masculine sex include the feminine. (b) In this chapter, the word: (1) “Must” is used in an imperative sense; (2) “May” is used in a permissive sense to state authority or permission to do the act prescribed, and the words “no person may * * *” or “a person may not * * *” mean that no person is required, authorized, or permitted to do the act prescribed; and (3) “Includes” means “includes but is not limited to”. [67 FR 8351, Feb. 22, 2002, as amended at 90 FR 21690, May 21, 2025]

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