 Maintenance of the route is split between NYSDOT , the New York State Thruway Authority ( NYSTA ) , and Erie County . All but the northernmost 0 @.@ 02 miles ( 0 @.@ 03 km ) 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 . 
