Interstate Business Route 8
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| CALIFORNIA
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| San Diego
| Decommissioned |
According to Daniel Faigin's California Highways Page, in the 1960s a business route was defined along Hotel Circle in Mission Valley. It is unclear if this business route was signed at the same time as the Washington Avenue/El Cajon Boulevard business route. |
| San Diego and La Mesa
| Decommissioned/Remnant Shields |
The business loop in San Diego and La Mesa, which began at the California 163 and Washington Street interchange and followed Normal Street and El Cajon Blvd (old U.S. 80) back to Interstate 8 in La Mesa, is largely decommissioned. While the sign located along westbound Interstate 8 ("Interstate 8 Business, Spring Street/El Cajon Boulevard" with a regular red, white, and blue shield instead of a green shield) is still in place, all reassurance shields are gone except for a few within San Diego city limits: near College Avenue, near Fairmount Avenue, at the 35th Street traffic signal, and at the top of the ramp from southbound California 163 to eastbound Washington Street. All shields in the San Diego community North Park and the city of La Mesa are gone. All approach signs from California 163 are also gone, with the northbound sign removed in 2001 and the southbound sign removed in October 2005. According to the California State Highway System Signing Log (October, 1991), Business Loop I-8 in San Diego and La Mesa runs from "Legislative State Route 163 at Washington Street via El Cajon Boulevard to Interstate 8 near Spring Street in La Mesa." |
| El Cajon
| Active |
Business Loop I-8 follows El Cajon Boulevard, Main Street, and County Business Route 8 through El Cajon and the unincorporated area just northeast of El Cajon along the county-maintained "Business Route 8." The county-maintained portion has street signs that read "Business Route 8." Only the section within El Cajon has the green shields, however. It's a matter of semantics as to whether Business Loop 8 ends at the El Cajon city limit or at the point where the county-maintained portion returns to Interstate 8 just west of Alpine. According to the California State Highway System Signing Log (October, 1991), Business Loop I-8 in El Cajon runs from "Interstate 8 near Chase Avenue over El Cajon Boulevard and Main Street to Interstate 8 near Oakdale Avenue," which does not include the county's "Business Route 8" in the unincorporated areas. |
| Alpine
| Active |
Business Loop I-8 in Alpine (an unincorporated community) follows Alpine Road along old U.S. 80. This business route is not in the state's 1991 signing log. |
| El Centro
| Active |
Well-signed but poorly mapped Business Loop 8 follows Imperial Avenue northbound, California 86 and Imperial County Route S-80 (Adams Avenue) eastbound, and Fourth Avenue (California 86) southbound through El Centro. According to the California State Highway System Signing Log (October, 1991), Business Loop I-8 in El Centro runs from "Interstate 8 and Imperial Avenue over Imperial Avenue, Adams Avenue, and Fourth Avenue to Interstate 8 and Fourth Avenue." |
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