AMP: 3 Location: Montana St and 26th St, Billings  Reassurance shield after Montana 3 AMP: 4 Location: 18th St and 1st Ave, Billings  A few blocks later, the one way grid ends, so we’ll need to turn right to continue east. The mileposts reset to .727 and will decrease from there AMP: 0 Location: 1st Ave  and 18th … Continue reading Interstate 90 Business, MT-3 to US-87