 The segment of I-5 from State Route 89 (SR 89) to US 97 forms part of the Volcanic Legacy Scenic Byway, an All-American Road.I-5 is also eligible to be included in the State Scenic Highway System; however, it is a scenic highway as designated by the California Department of Transportation (Caltrans) only from State Route 152 (SR 152) to I-580.I-5 begins at the San Ysidro Port of Entry from Mexico in the San Ysidro neighborhood of San Diego.