It is known as the Grand Army of the Republic Highway,[1] a designation shared nationally with U.S. Route 6.

Right after the I-89 junction, VT 15 enters the town of Colchester, with the road becoming known as College Parkway.

In Essex Junction, the road is known as Pearl Street and continues for about two miles (3 km) to the "Five Corners" intersection with VT 2A and VT 117 at the village center, near the Essex Junction-Burlington railroad station.

As VT 15 continues past the village, it turns northward to enter the town of Underhill.

Half a mile later, VT 15 enters the village of Cambridge then crosses the Lamoille River to follow the north bank instead.

VT 15 continues southeast for 2.5 miles (4.0 km) into the town of Hyde Park.

About 1.58 miles (2.54 km) beyond the town line, the road enters the village of Hyde Park, where it is joined from the north by VT 100.

The road follows the north shore of Joe's Pond, turning from south to east until it ends at an intersection with U.S. Route 2 in the West Danville community.

[6] Several of the most heavily trafficked sections of route 15 (such as the section between Morrisville and Cambridge, as well as between Jerico and Essex Center) are currently (June 2011) in very rough condition due to state and local road maintenance budget shortfalls and as well as recent harsh winters.

The route was streamlined to remove the unnecessary overlaps at both its ends, truncating it to its modern Winooski to West Danville designation.