NY 324 is known by two names along its routing: Grand Island Boulevard on Grand Island and Sheridan Drive in the northern suburbs of Buffalo. As the latter, the route serves as a major commercial strip for Tonawanda, Amherst, and Clarence. NY 324, assigned , is one of two routes to occupy part of Sheridan Drive; the other is New York State Route 325, which follows the westernmost of the street. NY 324 once extended northwest to downtown Niagara Falls; however, it was truncated to its current western terminus on January 1, 1962.