[Code of Federal Regulations] [Title 49, Volume 4] [Revised as of October 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR383.21] [Page 968] TITLE 49--TRANSPORTATION DEPARTMENT OF TRANSPORTATION PART 383_COMMERCIAL DRIVER'S LICENSE STANDARDS; REQUIREMENTS AND PENALTIES --Table of Contents Subpart B_Single License Requirement Sec. 383.21 Number of drivers' licenses. No person who operates a commercial motor vehicle shall at any time have more than one driver's license. [64 FR 48110, Sept. 2, 1999]