Interstate 38
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| Route information | ||||
| Defined by | ||||
| Maintained by Caltrans | ||||
| Length: | 2.126 mi (3.421 km) | |||
| Existed: | May 1983 by FHWA – present | |||
| Major junctions | ||||
| South end: |
  I-580 / SR 238 in Castro Valley
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| North end: |
 I-880 in San Leandro
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| Location | ||||
| Counties: | Alameda | |||
| Highway system | ||||
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Interstate 238 (I-238) is a short auxiliary route of the Interstate Highway System in the San Francisco Bay Area in the U.S. state of California. It comprises the northernmost 2.126 miles of Route 238, as defined by the California Streets and Highways Code. Originally signed as State Route 238 (SR 238) until 1983, it connects I-580 in Castro Valley (where SR 238 continues south) with I-880 in San Leandro.
This route is part of the California Freeway and Expressway System.
Although the 2.16-mile-long (3.48 km) I-238 goes in an east–west direction from Castro Valley to San Leandro, Caltrans officially signs it as a north–south freeway since the rest of SR 238 is more north–south. The south (or east) terminus of I-238 is at its interchange with I-580 and SR 238 in Castro Valley. From there, it enters into the southern portion of the census-designated place of Ashland, running parallel to its border with Cherryland. Then after entering San Leandro, I-238 terminates at I-880.
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