A Route 5 Business placard precedes Exit 72 for Cristianitos Road in northern San Diego County. This is the only remaining sign for the now-defunct business loop through the city of San Clemente in Orange County. 04/26/08
California generally references Interstate business loops once on a supplemental sign in text as “Route XX Business” on the freeway mainline.
Westbound SR 36 (Antelope Boulevard) at Business Loop I-5 (Main Street) and Tehama County Route A-8 in Downtown Red Bluff after crossing the Sacramento River bridge. An advance sign references historic U.S. 99. 05/24/08
Signs for Historic U.S. 99 are quite common along the business loops of Interstate 5 in Northern California, especially in places like Red Bluff and Dunsmuir.
Westbound SR 36 (Antelope Boulevard) combines with Business Loop I-5 (Main Street) from Downtown Red Bluff to Beegum Road, 1.6 miles to the north. 05/24/08
Diagrammatic overhead that once directed traffic along southbound Business Loop I-5/SR 273 at SR 299/44 north of Redding. Photo by Mike Ballard (1998).
SR 20 Business (E Street) east at Business Loop I-5 (Historic U.S. 99E) in Downtown Williams. Photo by Jerry Mullady (03/99)
Business Loop I-5 through Dunsmuir begins at Exit 729, but it is signed from the northbound mainline instead as Historic U.S. 99. Once on Dunsmuir Avenue, the business route is well-signed with reassurance shields. 05/25/08.
Reassurance marker posted along Dunsmuir Avenue north for Business Loop I-5. The 3.6 mile long route follows Historic U.S. 99. 05/25/08
Long since removed, this Business Loop “I-I-5” shield was posted along Dunsmuir Avenue south of the Sacramento River and north of Downtown Dunsmuir. Photo by Jerry Mullady (03/99).
The Mount Shasta business loop departs Interstate 5 northbound at Exit 737. 03/31/05
The stand alone shield posted for Business Loop I-5 at Exit 737 represents a rare shielding of an business route on an Interstate mainline in California. The one exception is the signing of Business Loop I-80 along Capital City Freeway at Sacramento.
This assembly directs motorists following Business Loop I-5 in Yreka to turn from Moonlit Oaks Avenue west onto SR 3 north. The route begins nearby at Exit 773. 05/26/08
Interstate 5 south at the off-ramp for Business Loop I-5 at Castle Rock, Washington. 09/02/06
The Castle Rock business loop is the only remaining business route for Interstate 5 in Washington. A handful of routes remain in service along I-90 as well.
Confirming marker for Business Loop I-5 eastbound after the route departed from I-5 & U.S. 12 at Exit 79 in Chehalis, Washington. The intersection of Chamber of Commerce Way and State Avenue here was eventually expanded to accommodate five lanes. A new marker for Business Loop I-5 was erected afterwards. It was still posted in 2014. Photo by Mark Bozanich (2000).
This overhead directed travelers along Business Loop I-205 northeast along 11th Street as the four lane highway split with Lovely Road. Photo by Mike Ballard (1998).
Unlike most business routes in California, Business Loop I-205 was signed more than once along I-5 southbound. This assembly preceding the split with Interstate 205 however was removed not long after this photo was shot by Joel Windmiller in September 2000.