AMP: 437 Location: I-90 and Frontage Rd, Yellowstone Cty Reassurance shield as the Laurel loop rejoins AMP: 437 Location: I-90 and Frontage Rd, Yellowstone Cty 17 miles to junction I-94 AMP: 443 Location: I-90 and Zoo Dr, Billings As we enter Billings the first time (we kind of skirt the city limits), we’ll pass Zoo … Continue reading Interstate 90, I-90 Bus to I-90 Bus