49 CFR § 564.4 - Definitions.

---
identifier: "/us/cfr/t49/s564.4"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 564.4 - Definitions."
title_number: 49
title_name: "Transportation"
section_number: "564.4"
section_name: "Definitions."
chapter_name: "NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
part_number: "564"
part_name: "REPLACEABLE LIGHT SOURCE AND SEALED BEAM HEADLAMP INFORMATION"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 322, 30111, 30115, 30117, 30166; delegation of authority at 49 CFR 1.50."
regulatory_source: "72 FR 68266, Dec. 4, 2007, unless otherwise noted."
cfr_part: "564"
---


# 564.4 Definitions.

All terms defined in the Act and the regulations and standards issued under its authority are used as defined therein.