APM: 13 Location: I-80 and I-680, Fairfield Reassurance shield for 80 and 12 after the 680 interchange. APM: 15 Location: I-80 and SR 12, Fairfield A couple miles later, SR 12 will split to continue east. APM: 15 Location: I-80 and SR 12, Fairfield Exit for 12 east to Suisun City and Rio Vista. Stay on I-80 for … Continue reading California State Route 12, I-680 to I-80