Most of the limited-access expressways and parkways are in the western and southern sections of Brooklyn, where the borough's two interstate highways are located; Interstate 278, which uses the Gowanus Expressway and the Brooklyn–Queens Expressway, traverses Sunset Park and Brooklyn Heights, while Interstate 478 is an unsigned route designation for the Brooklyn–Battery Tunnel, which connects to Manhattan. Other prominent roadways are the Prospect Expressway (New York State Route 27), the Belt Parkway, and the Jackie Robinson Parkway (formerly the Interborough Parkway). Planned expressways that were never built include the Bushwick Expressway, an extension of I-78 and the Cross-Brooklyn Expressway, I-878. Major thoroughfares include Atlantic Avenue, Fourth Avenue, 86th Street, Kings Highway, Bay Parkway, Ocean Parkway, Eastern Parkway, Linden Boulevard, McGuinness Boulevard, Flatbush Avenue, Pennsylvania Avenue, and Nostrand Avenue.