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 (I-190, the Niagara Section of the New York State Thruway) 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. 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. Route description According to the New York State Department of Transportation (NYSDOT), NY 324 begins at NY 384 in eastern Niagara Falls. NY 324 heads south, overlapping with I-190 (the Niagara Section of the New York State Thruway) across the North Grand Island Bridge to Grand Island, where it leaves the expressway at exit 20. However, as signed, NY 324 begins at the north end of Grand Island, where it splits off from the Interstate Highway as Grand Island Boulevard. South of exit 20, the official and signed routings are identical. Maintenance of the route is split between NYSDOT, the New York State Thruway Authority (NYSTA), and Erie County. All but the northernmost of the portion of the route that overlaps with I-190 is maintained by NYSTA. The two county-maintained sections extend from exit 20B to Grand Island Boulevard on Grand Island and from exit 15 to Grand Island Boulevard in Tonawanda, where NY 324 utilizes small portions of the county-owned Long Road and Kenmore Avenue, respectively. The remainder of NY 324 is maintained by NYSDOT. From I-190 exit 20, NY