Interstate 10 Business (Indio, California)
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| Location: | Blythe, California |
| Length: | 7.9 mi (12.7 km) |
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| Location: | Quartzsite, Arizona |
| Length: | 2.94 mi (4.73 km) |
| Existed: | 1991–present |
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| Location: | Benson, Arizona |
| Length: | 3.51 mi (5.65 km) |
| Existed: | 1991–present |
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| Location: | Willcox, Arizona |
| Length: | 8.33 mi (13.41 km) |
| Existed: | 1986–present |
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| Location: | Bowie, Arizona |
| Length: | 4.41 mi (7.10 km) |
| Existed: | 1980–present |
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| Location: | San Simon, Arizona |
| Length: | 3.90 mi (6.28 km) |
| Existed: | 1961–present |
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| Location: | Phoenix, Arizona |
| Existed: | ????–c. 1990 |
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| Location: | Lordsburg, New Mexico |
| Length: | 4.370 mi (7.033 km) |
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| Location: | Deming, New Mexico |
| Length: | 4.458 mi (7.174 km) |
Interstate business routes are roads connecting a central or commercial district of a city or town with an Interstate bypass. These roads typically follow along local streets often along a former U.S. route or state highway that had been replaced by an Interstate. Interstate business route reassurance markers are signed as either loops or spurs using a green shield shaped and numbered like the shield of the parent Interstate highway.
Along Interstate 10 (I-10), business routes are found in the four westernmost states through which I-10 passes: California, Arizona, New Mexico, and the far western region of Texas beyond the Pecos River. Although I-10 is a transcontinental highway, none of the states to the east along the Interstate have yet to designate I-10 business routes.
Some states regard Interstate business routes as fully integrated within their state highway system while other states consider them to be either local roads to be maintained by county or municipal authorities or a hybrid of state and local control.
Although the public may differentiate between different business routes by the number of the parent route and the location of the route, there is no uniform naming convention. Each state highway department internally uses its own designations to identify segments within its jurisdiction.
Interstate business routes in California are assigned by the California Department of Transportation (Caltrans), but are not maintained by Caltrans unless they overlay other routes of the state highway system. Local authorities may request route assignment from the Caltrans Transportation System Information Program, and all requests require approval of the executive committee of the American Association of State Highway and Transportation Officials (AASHTO).
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Wikipedia