APM: 39 Location: SR 94 and SR 188, San Diego Cty Reassurance shield after the SR 188 junction. APM: 41 Location: SR 94 and Potrero Valley Rd, Potrero, San Diego Cty A couple miles later, we’ll enter unincorporated Potrero. APM: 41 Location: SR 94 and Potrero Valley Rd, San Diego Cty Reassurance shield as we pass by Potrero. … Continue reading California State Route 94, SR 188 to I-8