APM: 8 Location: SR 29 and SR 12, Napa Reassurance shield as 12 joins 29. The route keeps 29’s postmiles. APM: 6 Location: SR 29 and SR 221, Napa Shortly thereafter we’ll approach SR 221. We’re advised to stay on 29 south for San Francisco. APM: 6 Location: SR 29 and SR 221, Napa Turn left for 221 … Continue reading California State Route 12, SR 29/SR 121 to SR 221