US Code - Title 23 Highways - Sec. 101.
[23 USC 101] - Definitions and declaration of policy
(11) Highway. -
The term "highway" includes -
(A) a road, street, and parkway;
(B) a right-of-way, bridge, railroad-highway crossing, tunnel, drainage
structure, sign, guardrail, and protective structure, in connection with a
(C) a portion of any interstate or international bridge or tunnel and the
approaches thereto, the cost of which is assumed by a State transportation
department, including such facilities as may be required by the United States
Customs and Immigration Services in connection with the operation of an
international bridge or tunnel.
* U.S. Department of Transportation (DOT)
Bureau of Transportation Statistics
- National Transportation Statistics 2002 -
Appendix B: Glossary
RURAL HIGHWAY: Any highway, road, or street that is not an urban highway.
URBAN HIGHWAY: Any road or street within the boundaries of an urban area. An urban area is an area including and adjacent to a municipality or urban place with a population of 5,000 or more. The boundaries of urban areas are fixed by state highway departments, subject to the approval of the Federal Highway Administration, for purposes of the Federal-Aid Highway Program.
* Washington State Department of Transportation
Traffic counts along many sections of urban highways show that these highways are at or near capacity.