About: Business routes of Interstate 8

There are five business routes of Interstate 8 (I-8). The portions of the I-8 business routes through California are mostly unsigned. All 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).