APM: 4 Location: SR 121 and Imola Ave, Napa Turn right onto Imola Avenue to follow SR 121. APM: 4 Location: Imola Ave and SR 29, Napa Reassurance shield after the turn. APM: 5 Location: Imola Ave and Foothill Blvd, Napa A few blocks later we’ll approach SR 221. Follow 221 south to Oakland, which is an interesting … Continue reading California State Route 121, SR 29 to SR 221