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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 at San Lorenzo, California at I-880. See Interstate 80 for more about these routes.
| Miles | km | ||
| 2 | 3 | California | |
| 2 | 3 | Total | |
I-238 exists because a short section of California State Highway 238 received Interstate funding; however, California had exhausted its list of I-x80 interstates. I-180 could not be used because the state already had an existing CA 180, and I-480 was being used for the Embarcadero Freeway (although it is available now due to its demolition as a result of the 1989 Loma Prieta earthquake). There is no Interstate 38, and if it did exist, it wouldn't go anywhere near Oakland, California.