[Code of Federal Regulations] [Title 22, Volume 1] [Revised as of April 1, 2001] From the U.S. Government Printing Office via GPO Access [CITE: 22CFR53.4] [Page 267] TITLE 22--FOREIGN RELATIONS CHAPTER I--DEPARTMENT OF STATE PART 53--PASSPORT REQUIREMENT AND EXCEPTIONS--Table of Contents Sec. 53.4 Optional use of a valid passport. Nothing in this part shall be construed to prevent a citizen from using a valid passport in a case in which that passport is not required by this part 53, provided such travel is not otherwise prohibited. [[Page 268]]