APM: 20 Location: I-680 and SR 4, Pacheco, Contra Costa Cty Reassurance shield after the SR 4 interchange. APM: 20 Location: I-680 and Concord Ave, Pleasant Hill I-680 very briefly clips the Pleasant Hill city limits. APM: 19 Location: I-680 and Concord Ave, Concord Just after that, we’ll enter Concord. APM: 19 Location: I-680 and Contra Costa Blvd, Concord … Continue reading Interstate 680, SR 4 to SR 242