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).

begins as El Cajon Boulevard at an interchange with I-8, loosely paralleling the freeway on the northern side.

The loop passes through Bostonia and Lakeview before ending at the Lake Jennings Park Road interchange with I-8.

is a business loop route that diverges from I-8 in El Centro, California, to pass through the downtown area.

originates and terminates with I-8 and acts as a direct link to El Centro as I-8 bypasses the downtown area.

is designated as part of the Juan Bautista de Anza National Historic Trail.

East of the airport, I-8 BL passes through less-developed areas of eastern Yuma before ending at I-8.

begins at an interchange with I-8 west of Gila Bend before passing under the freeway, continuing east and merging with SR 85 at a truck stop.

As Pima Street, the two highways continue through downtown Gila Bend before I-8 BL turns south away from SR 85 as Butterfield Trail and ending at I-8 at a diamond interchange.