The Joe DiMaggio Highway, commonly called the West Side Highway and formerly the Miller Highway, is a 5.42-mile-long (8.72 km) mostly surface section of New York State Route 9A (NY 9A), running from West 72nd Street along the Hudson River to the southern tip of Manhattan in New York City. It replaced the West Side Elevated Highway, built between 1929 and 1951, which was shut down in 1973 due to neglect and lack of maintenance, and was dismantled by 1989. North of 72nd Street the roadway continues north as the Henry Hudson Parkway.

New York State Route 9A (NY 9A) is a state highway in the vicinity of New York City in the United States. Its southern terminus is at Battery Place near the northern end of the Brooklyn–Battery Tunnel in New York City, where it intersects with both the unsigned Interstate 478 (I-478) and FDR Drive. The northern terminus of NY 9A is at U.S. Route 9 (US 9) in Peekskill. It is predominantly an alternate route of US 9 between New York City and Peekskill; however, in New York City, it is a major route of its own as it runs along the West Side Highway and Henry Hudson Parkway. It is also one of only two signed New York State routes in Manhattan. In northern Westchester County, NY 9A follows the Briarcliff–Peekskill Parkway.