Route 238, consisting of State Route 238(SR 238) and Interstate 238 (I-238), is a mostly north–south state and auxiliary Interstatehighway in the San Francisco Bay Area of California. The southern segment is signed as SR 238 and is a divided multilane surface highway that runs parallel to the Hayward hills between I-680 in Fremont and I-580 in Castro Valley. The northern segment is signed as I-238 and is a six-lane freeway that runs more east–west between I-580 and I-880 in San Leandro

Maintained by CALTRANS! A little over 11 miles long designated in 1934 as SR 9

_{Eastern end of Interstate 238 at the interchange with Interstate 580 in Ashland}