[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: 23CFR635.401] [Page 188] TITLE 23--HIGHWAYS CHAPTER I--FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 635--CONSTRUCTION AND MAINTENANCE--Table of Contents Subpart D--General Material Requirements Sec. 635.401 Purpose. Source: 41 FR 36204, Aug. 27, 1976, unless otherwise noted. The purpose of this subpart is to prescribe requirements and procedures relating to product and material selection and use on Federal-aid highway projects.