[Code of Federal Regulations] [Title 23, Volume 1] [Revised as of April 1, 2001] From the U.S. Government Printing Office via GPO Access [CITE: 23CFR635.501] [Page 191-192] 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 [[Page 192]] the level required by the purposes for which they were designed.