APM: 18 Location: I-5 and E St, Williams Just after the E St/SR 20 Business interchange, we’ll approach mainline SR 20. APM: 18 Location: I-5 and SR 20, Williams Follow SR 20 to Clear Lake and Colusa. APM: 18 Location: I-5 and SR 20, Williams Exit for SR 20.  N to I-5 Bus, S to I-5 Bus   … Continue reading Interstate 5, SR 20 Bus to SR 20