This follows the sign atop the page along Grove Way EB in Castro Valley. It makes more sense to me to get to I-580 WB by continuing straight at Center St. and then bearing right on Castro Valley Blvd. to an easy right turn. That could be why no one's replaced the shields.

I-580 eastbound, Exits 1-9
I-580 eastbound, Exits 10-21A
I-580 eastbound, Exit 21B and east

I-580 westbound, Exits 63-21B
I-580 westbound, Exits 21A-1


The Exit 19 ramps to I-980 EB come together and head southeast to this point. Left is the mainline, though only signed as the next exit.

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