It begins at an unconventional interchange, specifically one with a half diamond on the eastern quadrants, a wide flying westbound onramp on the northwest corner, and a long offramp with a connecting reentry ramp on the southwest corner.

I-84 Bus/US 30 climbs an embankment for a bridge over a canal and a set of railroad tracks, then makes a left turn toward the northeast.

The route curves back to the southeast at a fork in the road with Proctor Street just before officially crossing the city line at the triangle with South 650 East.

Further in town, the road curves straight east at the intersection with 3rd Avenue, then passes by the local church and elementary school.

Just after US 30 turns right at a frontage road along I-84, I-84 Bus ends at exit 141 (this time a conventional diamond interchange) and is taken over by US 26.

It travels from the diamond interchange known as exit 208 at SH-27 south across a bridge over the Snake River, then turns east onto US 30.

They curve to the northeast and cross a second bridge over the Snake River, where they enter Heyburn.

begins at exit 40 on I-84 in Tremonton and proceeds east along SR-102 (West Main Street) to pass under I-15 (with no access).

The reason for the folded diamond is due to the fact that the segment of SR-13 that the routes originally overlap runs along the north side of a Union Pacific Railroad line.

I-15 Bus/I-84 Bus/SR-13 curves to the right before turning south at the intersection with North Main Street, which is also the southern terminus of SR-38.

One and a half blocks later, they intersect 200th Street South, which also serves as the western terminus of SR-90, and instantly runs between the National Register of Historic Places-listed Box Elder Stake Tabernacle on the southeast corner of that intersection, and the contemporary but still traditional Brigham City Utah Temple on the southwest corner.

I-15 Bus/I-84 Bus ends at exit 362, a diverging diamond interchange with I-15/I-84, while West 1100th Street South continues into the I-15 frontage road, and becomes a dead-end street at the truck stop along the aforementioned frontage road.