AMP: 46 Location: Prospect Ave and I-15, Helena No reassurance shield after the 15 junction as 287 joins US 12 AMP: 48 Location: US 12 and 4th St, East Helena A few miles later, we’ll enter the town of East Helena AMP: 49 Location: US 12 and Lane Ave, East Helena 12/287 traverses the south … Continue reading U.S. Route 12, I-15/I-15 Bus/US-287 to S-518