APM: 8 Location: SR 29 and SR 12, Napa Reassurance shield as SR 121 joins SR 29 and the road turns into a short freeway. APM: 9 Location: SR 29 and Imola Ave, Napa In a mile SR 121 will split to continue north. APM: 10 Location: SR 29 and Imola Ave, Napa Exit ahead for 121 north … Continue reading California State Route 121, SR 12/SR 29 to SR 29