[Code of Federal Regulations] [Title 49, Volume 1] [Revised as of October 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR71.8] [Page 706] TITLE 49--TRANSPORTATION Subtitle A--Office of the Secretary of Transportation PART 71_STANDARD TIME ZONE BOUNDARIES--Table of Contents Sec. 71.8 Mountain zone. The fourth zone, the mountain standard time zone, includes that part of the United States that is west of the boundary line between the central and mountain standard time zones described in Sec. 71.7 and east of the boundary line between the mountain and Pacific standard time zones described in Sec. 71.9.