Route Description
Although the 2.16-mile (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 State Route 238 is more north–south. The south (or east) terminus of I-238 is at its interchange with Interstate 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 Interstate 880.
I-238 and I-880 is used as an alternate truck route between Castro Valley and Oakland; trucks over 4.5 tons are prohibited through the latter on I-580.
Read more about this topic: Interstate 238
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