49 CFR § 593.4 - Definitions.

---
identifier: "/us/cfr/t49/s593.4"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 593.4 - Definitions."
title_number: 49
title_name: "Transportation"
section_number: "593.4"
section_name: "Definitions."
chapter_name: "NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
part_number: "593"
part_name: "DETERMINATIONS THAT A VEHICLE NOT ORIGINALLY MANUFACTURED TO CONFORM TO THE FEDERAL MOTOR VEHICLE SAFETY STANDARDS IS ELIGIBLE FOR IMPORTATION"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 322 and 30141(b); delegation of authority at 49 CFR 1.95."
regulatory_source: "54 FR 40099, Sept. 29, 1989, unless otherwise noted."
cfr_part: "593"
---


# 593.4 Definitions.

All terms in this part that are defined in section 102 of the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1391) are used as defined therein.

*Administrator* means the Administrator of the National Highway Traffic Safety Administration.

*Model year* means the year used by a manufacturer to designate a discrete vehicle model irrespective of the calendar year in which the vehicle was actually produced, or the model year as designated by the vehicle's country of origin, or, if neither the manufacturer nor the country of origin has made such a designation, the calendar year (*i.e.,* January 1 through December 31) in which manufacturing operations are completed on the vehicle at its place of main assembly.

*NHTSA* means the National Highway Traffic Safety Administration.

*Registered Importer* means any person who has been granted registered importer status by the Administrator pursuant to paragraph 592.5(b) of this chapter, and whose registration has not been revoked.

[54 FR 40099, Sept. 29, 1989, as amended at 76 FR 53080, Aug. 25, 2011]