New York State Route 324 (NY 324) is an east–west state highway located in the western portion of New York in the United States. Officially, NY 324 begins at NY 384 in Niagara Falls and overlaps Interstate 190 south to Grand Island, where it separates from I-190 and continues southward as Grand Island Boulevard. As signed, however, NY 324 begins at the southern end of the official overlap and is contained entirely within Erie County. At the southern edge of Grand Island, NY 324 joins I-190 to cross over to the mainland, where it runs due east across three towns before reaching its eastern end at a junction with NY 5 in the town of Clarence.

New York State Route 384 (NY 384) is a state highway in Western New York in the United States. It is a north–south route extending from the city of Buffalo, Erie County to the city of Niagara Falls, Niagara County, and is one of several routes directly connecting the two cities. The southern terminus of the route is at NY 5 in downtown Buffalo. NY 384's northern terminus is at the Rainbow Bridge in downtown Niagara Falls. Through its entire course in Erie County, it is known as Delaware Avenue for the street it follows in the city. In Niagara County, NY 384 follows the Niagara River and is named River Road and Buffalo Avenue.