Interstate 238 is a short
interstate highway entirely within the state of
California. Its western terminus is at
Hayward, California at an intersection with I-580 and CA 238 and its eastern terminus is at
San Lorenzo, California at I-880. See
Interstate 80 for more about these routes.
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It exists because a short section of
California State Highway 238[?] got Interstate funding and California had exhausted its list of I-x80 interstates.
(Today, I-480 is available because that freeway was torn down as a result of the 1989 earthquake.) There is no Interstate 38, and if it did exist, it wouldn't go anywhere near
Oakland, California.