 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 . 
