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List of business routes of the Interstate Highway System

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 (AASHTO). These routes connect a central or commercial district of a city or town with an Interstate bypass, and 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.

Dwight D. Eisenhower National System of Interstate and Defense Highways

Interstate 24 Business marker

Interstate 196 Business marker

Highway shields for Business Loop Interstate 24 and Business Spur Interstate 196
Interstate Highways in the 48 contiguous states
System information
FormedJune 29, 1956[1]
Highway names
InterstatesInterstate 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)
System links

As the main purpose of these routes are to serve a certain downtown area, business Interstates are typically routed along surface roads. These routes do not have to meet Interstate Highway standards and are not considered part of the Interstate Highway System. AASHTO does, however, apply similar standards as to new U.S. Highways, requiring a new business Interstate to meet certain design standards.[2] 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.

Business Interstates are most often posted in the western states, across the Great Plains and in Michigan. Eastern states generally did not designate business routes, as most of the Interstates paralleled the original U.S. Highways instead of directly replacing them. With the exception of mountainous areas, this left most of the U.S. Highways in place, or as co-signed routes with the parent Interstate, while the former routes were redesignated as local or frontage roads. In contrast, construction of the Interstate system in the western states often directly overlaid the old U.S. Highway, leaving the former road impassable or as a disconnected route. Exceptions were at cities and towns, where the freeway would shift onto a bypass around them. This often left extant segments of old U.S. Highways in place, with a business route designation applied to them as a motorist aid to and from a business district of collection of motorists services. Although business Interstates are primarily found along mainline Interstates, some auxiliary Interstates can also have their own business route designations.

Like auxiliary Interstates, business Interstates can be repeated from state to state along their route. The only difference is that business Interstates can also be repeated in several locations within the same state.

Contents:

List

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Defunct routes are listed in italics.

Interstate 5

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Main article: Business routes of Interstate 5

Interstate 205

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Interstate 8

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Main article: Business routes of Interstate 8

Interstate 10

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Main article: Business routes of Interstate 10

Interstate 15

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Main article: Business routes of Interstate 15

Interstate 17

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Interstate 19

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Interstate 20

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Main article: Business routes of Interstate 20 (disambiguation)

Interstate 24

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Interstate 25

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Main article: Business routes of Interstate 25

Interstate 126

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Interstate 526

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Interstate 27

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Interstate 29

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Main article: Business routes of Interstate 29

Interstate 229

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Interstate 30

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Interstate 35

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Main article: Business routes of Interstate 35

Interstate 40

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Main article: Business routes of Interstate 40

Interstate 44

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Main article: Business routes of Interstate 44

Interstate 45

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Main article: Business routes of Interstate 45

Interstate 49

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Main article: Business routes of Interstate 49

Interstate 55

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Main article: Business routes of Interstate 55

Interstate 65

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Interstate 69

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Main article: Business routes of Interstate 69 in Michigan

Interstate 70

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Main articles: Business routes of Interstate 70 and Business routes of Interstate 70 in Colorado

Interstate 72

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Interstate 75

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Main articles: Business routes of Interstate 75 and Business routes of Interstate 75 in Michigan

Interstate 375

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Interstate 76 (west)

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Interstate 376

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Interstate 80

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Main article: Business routes of Interstate 80

Interstate 83

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Interstate 84 (east)

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Interstate 84 (west)

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Main article: Business routes of Interstate 84

Interstate 85

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Main article: Interstate 85 Business

Interstate 385

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Interstate 585

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Interstate 86 (west)

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Interstate 89

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Interstate 90

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Main article: Business routes of Interstate 90

Interstate 94

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Main articles: Business routes of Interstate 94 and Business routes of Interstate 94 in Michigan

Interstate 95

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Main article: Interstate 95 Business

Interstate 495

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Interstate 96

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Main article: Business routes of Interstate 96

Interstate 196

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Interstate 496

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Interstate 696

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See also

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Notes

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  1. ^ Downtown Loop I-24 in Paducah, Kentucky was changed to Business Loop I-24 in 2002.
  2. ^ 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.

References

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  1. ^ Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. 60 (1). Washington, DC: Federal Highway Administration. Retrieved March 16, 2012.
  2. ^ Special Committee on U.S. Route Numbering (November 15, 1997). "Report of the Special Committee on U.S. Route Numbering to the Standing Committee on Highways" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived from the original (PDF) on October 16, 2017.
  3. ^ District 11-0 (August 19, 2009). "I-376 Corridor New Exit Numbers" (PDF). Pennsylvania Department of Transportation. Retrieved November 21, 2009.{{cite web}}: CS1 maint: numeric names: authors list (link)[permanent dead link]


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