APM: 23 Location: SR 128 and SR 121, Napa Cty Reassurance shield after the 121 junction. APM: 18 Location: SR 128 and Knoxville Rd, Napa Cty A few miles later we’re advised to keep left to stay on 128. APM: 15 Location: SR 128 and Lower Chiles Valley Rd, Napa Cty Another reassurance shield a few miles later. … Continue reading California State Route 128, SR 121 to SR 29