List of business routes of the Interstate Highway System

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Dwight D. Eisenhower National System of Interstate and Defense Highways
Interstate 24 Business markerInterstate 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
  • 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.

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 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.

Like auxiliary Interstate Highways, Business Interstates can be repeated from state to state along their route. However, unlike auxiliary Interstate Highways, Business Interstates can also be repeated in several locations within the same state.

Contents:

List[]

Defunct routes are listed in italics.

Interstate 5[]

Main article: Business routes of Interstate 5
  • I-5 Bus.—San Ysidro, National City and San Diego, California
  • I-5 Bus.—San Diego, California
  • I-5 Bus.—Solana Beach, California
  • I-5 Bus.—San Clemente, California
  • I-5 Bus.—Irvine, California
  • I-5 Bus.—Los Angeles, California
  • I-5 Bus.–Coalinga, California
  • I-5 Bus.—Woodland, California
  • I-5 Bus.—Arbuckle, California
  • I-5 Bus.—Williams and Maxwell, California
  • I-5 Bus.—Willows and Orland, California
  • I-5 Bus.—Red Bluff, California
  • I-5 Bus.—Cottonwood, California
  • I-5 Bus.—Anderson and Redding, California
  • I-5 Bus.—Dunsmuir, California
  • I-5 Bus.—Mount Shasta, California
  • I-5 Bus.—Weed, California
  • I-5 Bus.—Yreka, California
  • I-5 Bus.—Vancouver, Washington
  • I-5 Bus.—Castle Rock, Washington
  • I-5 Bus.—Chehalis and Centralia, Washington
  • I-5 Bus.—Olympia, Washington
  • I-5 Bus.—Fife, Washington and Midway (near Des Moines, Washington)
  • I-5 Bus.—Seattle, Washington
  • I-5 Bus.—Marysville, Washington and Everett, Washington
  • I-5 Bus.—Bellingham, Washington

Interstate 205[]

  • I-205 Bus.—Tracy, California

Interstate 8[]

Main article: Business routes of Interstate 8
  • I-8 Bus.—San Diego, California
  • I-8 Bus.—El Cajon, California
  • I-8 Bus.—Alpine, California
  • I-8 Bus.—El Centro, California
  • State Bus. Route 8 (1)—Winterhaven, California and Yuma, Arizona
  • State Bus. Route 8 (3)—Gila Bend, Arizona

Interstate 10[]

Main article: Business routes of Interstate 10
  • I-10 Bus.—Ontario, California
  • I-10 Bus.—Colton, California
  • I-10 Bus.—Indio, California
  • I-10 Bus.—Blythe, California
  • State Bus. Route 10 (1)—Quartzsite, Arizona
  • State Bus. Route 10—Phoenix, Arizona
  • State Bus. Route 10—Casa Grande, Arizona
  • State Bus. Route 10 (2)—Tucson, Arizona
  • State Bus. Route 10 (3)—Benson, Arizona
  • State Bus. Route 10 Spur—Benson, Arizona
  • State Bus. Route 10 (4)—Willcox, Arizona
  • State Bus. Route 10 (5)—Bowie, Arizona
  • State Bus. Route 10 (6)—San Simon, Arizona
  • BL 21—Lordsburg, New Mexico
  • BL 22—Deming, New Mexico
  • BL—Las Cruces, New Mexico
  • Bus. I-10-C—Sierra Blanca, Texas
  • Bus. I-10-D—Van Horn, Texas
  • Bus. I-10-F—Balmorhea, Texas
  • Bus. I-10-G—Fort Stockton, Texas

Interstate 15[]

Main article: Business routes of Interstate 15
  • I-15 Bus.—Escondido, California
  • I-15 Bus.—Victorville, California
  • I-15 Bus.—Barstow, California
  • I-15 Bus.—Mesquite, Nevada
  • I-15 Bus.- St. George, Utah
  • I-15 Bus.—Cedar City, Utah
  • I-15 Bus.—Parowan, Utah
  • I-15 Bus.—Beaver, Utah
  • I-15 Bus.—Fillmore, Utah
  • I-15 Bus.—Holden, Utah
  • I-15 Bus.—Nephi, Utah
  • I-15 Bus.—Layton, Utah
  • I-15 Bus.—Brigham City, Utah
  • I-15 Bus.—Tremonton, Utah
  • I-15 Bus.—Pocatello, Idaho
  • I-15 Bus.—Idaho Falls, Idaho
  • I-15 Bus.—Butte, Montana
  • I-15 Bus.—Helena, Montana
  • I-15 Bus.—Great Falls, Montana
  • I-15 Bus.—Conrad, Montana
  • I-15 Bus.—Shelby, Montana

Interstate 17[]

Interstate 19[]

  • State Bus. Route 19 (1)—Nogales, Arizona
  • State Bus. Route 19 (2)—Sahuarita, Arizona – Tucson, Arizona (Still shown on all Rand McNally road atlases.)

Interstate 20[]

Main article: Business routes of Interstate 20 (disambiguation)

Interstate 24[]

  • I-24 Bus.—Paducah, Kentucky
  • Downtown Loop ¹—Paducah, Kentucky

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

Interstate 25[]

Main article: Business routes of Interstate 25
  • BL (11)—Williamsburg, New Mexico – Truth or Consequences, New Mexico
  • BL (12)—Socorro, New Mexico
  • BL (13)—Belen, New Mexico
  • BL (14)—Santa Fe, New Mexico
  • BL (15)—Las Vegas, New Mexico
  • BL (16)—Springer, New Mexico
  • BL (17)—Raton, New Mexico
  • State Highway 25A—Trinidad, Colorado
  • State Highway 25B Spur—Aguilar, Colorado
  • State Highway 25C—Walsenburg, Colorado
  • State Highway 25 Bus.—Colorado Springs, Colorado
  • State Highway 25 Bus.—Castle Rock, Colorado (Likely unsigned)
  • I-25 Bus.—Cheyenne, Wyoming
  • I-25 Bus.—Chugwater, Wyoming
  • I-25 Bus.—Wheatland, Wyoming
  • I-25 Bus.—Douglas, Wyoming
  • I-25 Bus.—Glenrock, Wyoming
  • I-25 Bus.—Casper, Wyoming
  • I-25 Bus.—Buffalo, Wyoming

Interstate 126[]

  • I-126 BS—Columbia, South Carolina

Interstate 526[]

  • I-526 BS—Mount Pleasant, South Carolina

Interstate 27[]

Interstate 29[]

Main article: Business routes of Interstate 29

Interstate 229[]

  • I-229 Downtown Loop—Sioux Falls, South Dakota

Interstate 30[]

Interstate 35[]

Main article: Business routes of Interstate 35

Interstate 40[]

Main article: Business routes of Interstate 40
  • I-40 Bus.—Needles, California
  • State Bus. Route 40 (0)—Kingman, Arizona
  • State Bus. Route 40 (1)—Seligman, Arizona
  • State Bus. Route 40 (2)—Ash Fork, Arizona
  • State Bus. Route 40 (3)—Williams, Arizona
  • State Bus. Route 40 (4)—Flagstaff, Arizona
  • State Bus. Route 40 (5)—Flagstaff, Arizona
  • State Bus. Route 40 (6)—Winslow, Arizona
  • State Route 40 Spur—Winslow, Arizona
  • State Bus. Route 40 (7)—Joseph City, Arizona
  • State Bus. Route 40 (8)—Holbrook, Arizona
  • I-40 Bus.—Gallup, New Mexico
  • I-40 Bus.—Grants, New Mexico
  • I-40 Bus.—Albuquerque, New Mexico
  • Bus. Route 40 (34)—Moriarty, New Mexico
  • Bus. Route 40 (35)—Santa Rosa, New Mexico
  • Bus. Route 40 (36)—Tucumcari, New Mexico
  • Bus. I-40-A†—Glenrio, Texas
  • Bus. I-40-B—Adrian, Texas
  • Bus. I-40-C—Vega, Texas
  • Bus. I-40-D—Amarillo, Texas
  • Bus. I-40-F—Groom, Texas
  • Bus. I-40-H—McLean, Texas
  • Bus. I-40-J—Shamrock, Texas
  • I-40 Bus.—Erick, Oklahoma
  • I-40 Bus.—Sayre, Oklahoma
  • I-40 Bus.—Elk City, Oklahoma
  • I-40 Bus.—Clinton, Oklahoma
  • I-40 Bus.—Weatherford, Oklahoma
  • I-40 Bus.—El Reno, Oklahoma
  • I-40 Bus.—Henryetta, Oklahoma
  • I-40 Bus.—Sallisaw, Oklahoma
  • I-40 Bus.—Winston-Salem and Greensboro, North Carolina (Winston-Salem portion removed in February 2020; Greensboro portion (separated by a six-mile gap) removed September 2008)
  • I-40 Bus.—Raleigh, North Carolina (Replaced by Interstate 440)

† 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.

Interstate 44[]

Main article: Business routes of Interstate 44

Interstate 45[]

Main article: Business routes of Interstate 45

Interstate 49[]

Main article: Business routes of Interstate 49
  • I-49 Bus.—Neosho, Missouri
  • I-49 Bus.—Joplin, Missouri
  • I-49 Bus.—Nevada, Missouri
  • I-49 Bus.—Butler, Missouri

Interstate 55[]

  • I-55 Bus.—New Madrid, Missouri
  • I-55 Bus.—Cape Girardeau-Fruitland, Missouri
  • I-55 Bus.—Crystal City, Missouri
  • I-55 Bus.—Springfield, Illinois
  • I-55 Bus.—Lincoln, Illinois
  • I-55 Bus.—Bloomington-Normal, Illinois

Interstate 65[]

  • I-65 Bus.—Lebanon, Indiana

Interstate 69[]

Main article: Business routes of Interstate 69 in Michigan
  • BL I-69—Charlotte, Michigan
  • BL I-69—Coldwater, Michigan
  • BL I-69—Lansing, Michigan
  • BL I-69—Port Huron, Michigan

Interstate 70[]

Main articles: Business routes of Interstate 70 and Business routes of Interstate 70 in Colorado
  • I-70 Bus.—Richfield, Utah
  • I-70 BS—Salina, Utah
  • I-70 Bus.—Green River, Utah
  • I-70 Bus.—Grand Junction, Colorado
  • I-70 Bus.—Palisade, Colorado
  • I-70 Bus.—Rifle, Colorado (Unsigned)
  • I-70 Bus.—Silt, Colorado (Unsigned)
  • I-70 Bus.—Eagle, Colorado (Unsigned)
  • I-70 Bus.—Edwards, Colorado (Unsigned)
  • I-70 Bus.—Avon, Colorado
  • I-70 Bus.—Frisco, Colorado
  • I-70 Bus.—Idaho Springs, Colorado
  • I-70 Bus.—Denver, Colorado
  • I-70 Bus.—Watkins, Colorado
  • I-70 Bus.—Strasburg, Colorado (Unsigned)
  • I-70 Bus.—Deer Trail, Colorado (Unsigned)
  • I-70 Bus.—Agate, Colorado (Unsigned)
  • I-70 Bus.—Limon, Colorado
  • I-70 Bus.—Vona, Colorado (Unsigned)
  • I-70 Bus.—Burlington, Colorado
  • I-70 Bus.—Colby, Kansas
  • I-70 Bus.—Oakley, Kansas
  • I-70 Bus.—Hays, Kansas
  • I-70 Bus.—Boonville, Missouri
  • I-70 Bus.—Columbia, Missouri
  • I-70 Bus.—St. Charles, Missouri
  • I-70 Bus.—Springfield, Ohio

Interstate 72[]

  • I-72 Bus.—Jacksonville, Illinois

Interstate 75[]

Main articles: Business routes of Interstate 75 and Business routes of Interstate 75 in Michigan
  • BS I-75—Sault Ste. Marie, Michigan
  • BL I-75—St. Ignace, Michigan
  • BL I-75—Gaylord, Michigan
  • BL I-75—Grayling, Michigan
  • BL I-75—Roscommon, Michigan
  • BL I-75—West Branch, Michigan
  • BL I-75—Saginaw, Michigan
  • BL I-75—Pontiac, Michigan
  • BL I-75—Findlay, Ohio
  • BL I-75—Sidney, Ohio
  • BL I-75—Troy–Piqua, Ohio
  • I-75 Bus.—Cordele, Georgia
  • I-75 Bus.—Adel, Georgia
  • I-75 Bus.—Tifton, Georgia
  • I-75 Bus.—Valdosta, Georgia

Interstate 375[]

  • BS I-375—Detroit, Michigan (unsigned)

Interstate 76 (west)[]

Interstate 376[]

  • I-376 Bus.—Moon Township, Pennsylvania (Created in 2009, replacing PA 60 Business.[3])

Interstate 80[]

Main article: Business routes of Interstate 80

Interstate 83[]

  • I-83 Bus.—York, Pennsylvania

Interstate 84 (east)[]

  • I-84 Bus.—Newtown, Connecticut (Now signed as part of US Route 6.)

Interstate 84 (west)[]

Main article: Business routes of Interstate 84

Interstate 85[]

Interstate 385[]

  • I-385 BS—Greenville, South Carolina (Unsigned since 2007)

Interstate 585[]

  • I-585 BS—Spartanburg, South Carolina

Interstate 86 (west)[]

Interstate 89[]

  • I-89 BS—Lebanon, New Hampshire

Interstate 90[]

Main article: Business routes of Interstate 90

Interstate 94[]

Main articles: Business routes of Interstate 94 and Business routes of Interstate 94 in Michigan
  • BL I-94—Benton Harbor–St. Joseph, Michigan
  • BS I-94—Kalamazoo, Michigan
  • BL I-94—Battle Creek, Michigan
  • BL I-94—Marshall, Michigan
  • BL I-94—Albion, Michigan
  • BL I-94—Jackson, Michigan
  • BL I-94—Ann Arbor, Michigan
  • BL I-94—Port Huron, Michigan

Interstate 95[]

  • I-95 Bus.—Brunswick, Georgia
  • I-95 Bus.—Darien, Georgia
  • I-95 Bus.—Fayetteville, North Carolina
  • I-95 Bus.—Wilson and Rocky Mount, North Carolina
  • —Emporia, Virginia
  • I-95 Bus.—Wilmington, Delaware (Proposed around 2000 (I-95 would have shifted to what is still I-495), but rejected by city's mayor—section was temporarily signed as I-895 in early 1980s.)
  • - Mystic, Connecticut

Interstate 495[]

  • I-495 BS—Lowell, Massachusetts

Interstate 96[]

Main article: Business routes of Interstate 96

Interstate 196[]

  • BL I-196—South Haven, Michigan
  • BL I-196—Holland, Michigan
  • BS I-196—Wyoming, Michigan

Interstate 496[]

Interstate 696[]

  • BS I-696—Detroit, Michigan

References[]

  1. ^ 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.
  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 (PDF) from the original 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.[permanent dead link]

External links[]

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