AMP: 0 Location: Montana Ave and Lyndale Ave, Helena A few blocks later, we’ll approach 15 Business again, now with US 12 attached. Stay straight for 15 Business South/12 East. Turn right for 15 Business North/12 West. S-229 ends.  N to S-279  S to I-15/US-12/US-287, N to US-12   E to I-15/I-15 Bus/US-287, W to … Continue reading Montana Secondary Highway 229, I-15 Bus to I-15 Bus/US-12