[Code of Federal Regulations] [Title 23, Volume 1] [Revised as of April 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 23CFR635.501] [Page 192] TITLE 23--HIGHWAYS CHAPTER I--FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 635--CONSTRUCTION AND MAINTENANCE--Table of Contents Subpart E--Interstate Maintenance Guidelines Sec. 635.501 Purpose. Source: 45 FR 20793, Mar. 31, 1980, unless otherwise noted. To prescribe Interstate maintenance guidelines and establish the policy and procedures to insure that the condition of Interstate routes is maintained at the level required by the purposes for which they were designed.