|Dwight D. Eisenhower National System of Interstate and Defense Highways|
Highway shields for Business Loop Interstate 24 and Business Spur Interstate 196
Interstate Highways in the 48 contiguous states
|Formed||June 29, 1956|
|Interstates||Interstate nn (I-nn)|
|Business Loop:||Business Loop Interstate nn (BL I-nn)|
Interstate nn Business Loop (I-nn Bus. or I-nn BL)
|Business Spur:||Business Spur Interstate nn (BS I-nn)|
Interstate nn Business Spur (I-nn Bus. or I-nn BS)
The Interstate Highway System of the United States, in addition to being a network of freeways, also includes a number of Business Routes assigned by the American Association of State Highway and Transportation Officials. The routes are signed with green shields resembling the Interstate Highway shield. The word BUSINESS is used instead of INTERSTATE, and, above the number, where the state name is sometimes included, the word LOOP or SPUR appears. A business loop has both ends as its "parent", while a business spur has a "dangling end", sometimes running from the end of the Interstate to the downtown area.
As the main purpose of a Business Interstate is to serve a downtown area, it is typically routed on surface roads. Thus Business Interstates do not meet Interstate Highway standards. AASHTO does, however, apply similar standards as to new U.S. Routes, requiring a new Business Interstate to meet certain design standards. Business Interstates are also sometimes routed onto freeways that were once designated as mainline Interstates themselves (such as the now-decommissioned Interstate 40 Business in Winston-Salem, North Carolina, and the existing Interstate 80 Business in Sacramento, California).
Unlike auxiliary Interstate Highways, business Interstates can be repeated in several locations in the same state.
|Contents:||I-5 I-205 I-8 I-10 I-15 I-16 I-20 I-24 I-25 I-26 I-27 I-29 I-229 I-30 I-35 I-40 I-44 I-45 I-55 I-59 I-64 I-65 I-66 I-69 I-70 I-71 I-72 I-74 I-75 I-375 I-376 I-77 I-78 I-79 I-80 I-81 I-82 I-83 I-84(E) I-84(W) I-85 I-385 I-585 I-86 I-87 I-89 I-90 I-94 I-95 I-495 I-96 I-196 I-496 I-696|
† Business Loop I-40 for Glenrio, Texas is a spur route (at the New Mexico state line it becomes a country road), but is posted as a business loop.
¹ Downtown Loop I-24 in Paducah, Kentucky was changed to Business Loop I-24 in 2002.
- Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. Washington, DC: Federal Highway Administration. 60 (1). Retrieved March 16, 2012.
- AASHTO, Report of the Standing Committee on U.S. Route Numbering to the Standing Committee on Highways Archived 2006-05-26 at the Wayback Machine, November 15, 1997
- PennDOT District 11-0, I-376 Corridor New Exit Numbers[permanent dead link], August 19, 2009, accessed November 2009