APM: 31 Location: MacArthur Fwy and I-238, Castro Valley, Alameda Cty Reassurance shield after the I-238 split. APM: 31 Location: MacArthur Fwy and I-238, Castro Valley, Alameda Cty I-580 is the MacArthur Freeway as it runs up the East Bay. APM: 32 Location: MacArthur Fwy and Miramar Ave, Castro Valley, Alameda Cty Reassurance shield after the Miramar Ave … Continue reading Interstate 580, I-238/SR 238 to SR 13