United States Code (USC)
(U.S. law) The United States Code is the codification by subject matter of the general and permanent laws of the United States. It is divided by broad subjects into 50 titles and published by the Office of the Law Revision Counsel of the U.S. House of Representatives. Since 1926, the United States Code has been published every six years. In between editions, annual cumulative supplements are published in order to present the most current information.
Of particular interest is “Title 49–Transportation,” which is divided into 10 subtitles:
Subtitle I–Department of Transportation
Subtitle II–Other Government Agencies
Subtitle III–General and Intermodal Programs
Subtitle IV–Interstate Transportation
Subtitle V–Rail Programs
Subtitle VI–Motor Vehicle and Driver Programs
Subtitle VII–Aviation Programs
Subtitle IX–Commercial Space Transportation
The USC is found in larger public libraries and is available for purchase from the Superintendent of Documents; U.S. Government Printing Office; Mail Stop: IDCC; 732 N. Capitol Street, NW; Washington, DC 20401; Tel:  (866) 512-1800,  (202) 512-1800; Fax:  (202) 512-2104; Web: www.gpoaccess.gov. There are also local offices of the U.S. Government Printing Office in major U.S. cities.