APM: 10 Location: SR 29 and Imola Ave, Napa Reassurance shield as 121 joins 29. APM: 9 Location: SR 29 and SR 12, Napa Just ahead we’ll approach SR 12. I got caught in traffic heading back to San Francisco on a Sunday afternoon. APM: 9 Location: SR 29 and SR 12, Napa Keep right for 121 north … Continue reading California State Route 29, SR 121 to SR 12/SR 121