[Code of Federal Regulations] [Title 49, Volume 6] [Revised as of October 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR564.4] [Page 173] TITLE 49--TRANSPORTATION CHAPTER V--NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 564_REPLACEABLE LIGHT SOURCE INFORMATION--Table of Contents Sec. 564.4 Definitions. All terms defined in the Act and the regulations and standards issued under its authority are used as defined therein.