APM: 0 Location: SR 4 and I-80, Hercules Reassurance shield as SR 4 begins. APM: 1 Location: SR 4 and Sycamore Ave, Contra Costa Cty Reassurance shield as we head out of Hercules. APM: 4 Location: SR 4 and Cummings Skwy, Contra Costa Cty Reassurance shield after Cummings Skyway. APM: 7 Location: SR 4 and Alhambra Ave, Martinez A … Continue reading California State Route 4, I-80 to I-680