[Code of Federal Regulations] [Title 23, Volume 1] [Revised as of April 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 23CFR657.3] [Page 251] TITLE 23--HIGHWAYS CHAPTER I--FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 657_CERTIFICATION OF SIZE AND WEIGHT ENFORCEMENT--Table of Contents Sec. 657.3 Definition. Enforcing or enforcement means all actions by the State to obtain compliance with size and weight requirements by all vehicles operating on the FA Interstate, primary, urban, and secondary systems.