New York State Route 27

New York State Route 27 (NY 27) is a 120.58-mile (194.05 km) long state highway that runs east–west from Interstate 278 (I-278) in the New York City borough of Brooklyn to Montauk Point State Park on Long Island, New York. Its two most prominent components are Sunrise Highway and Montauk Highway, the latter of which includes the Montauk Point State Parkway. NY 27 acts as the primary east–west highway on southern Long Island east of the interchange with the Heckscher State Parkway in Islip Terrace. The entire route in Suffolk, Nassau, and Queens counties were designated by the New York State Senate as the POW/MIA Memorial Highway. The highway gives access to every town on the South Shore. NY 27 is the easternmost state route in the state of New York, as well as the longest highway on Long Island.

Except for a short stretch in Great River, NY 27 has service roads that parallel the highway continuously from North Lindenhurst to Patchogue, and intermittently to the east into Southampton. They are officially designated, but not signed, as New York State Route 906C eastbound and New York State Route 906D westbound.

NY 27 begins at exit 24 of I-278 (the Gowanus Expressway) in the borough of Brooklyn in New York City. For the first stretch through Brooklyn, NY 27 runs along the Prospect Expressway — a sunken six-lane freeway through the Park Slope and Windsor Terrace neighborhoods — providing interchanges with Fourth Avenue, Seventh Avenue, and 11th Avenue. At exit 5, eastbound NY 27 leaves the Prospect Expressway; the highway interchanges with Ocean and Fort Hamilton Parkways before ending a short distance to the south at exit 6 and Church Avenue. Eastbound NY 27 follows East 5th Street to Caton Avenue; westbound NY 27 leaves Caton Avenue at Coney Island Avenue, then follows Church Avenue to the Prospect Expressway.

NY 27 runs along Caton Avenue near the south end of Prospect Park in Flatbush. A short distance east, the street merges into Linden Boulevard, crossing eastward through Brooklyn on Linden. NY 27 passes east through East Flatbush and reaches a large intersection with Kings Highway and Remsen Avenue, where it expands into a six-lane boulevard through Brooklyn with frontage roads. East of East 96th Street, NY 27 intersects Rockaway Parkway and then travels under the BMT Canarsie Line, winding through New Lots before turning northeast. After crossing under a nearby subway yard, the boulevard passes through the City Line neighborhood. Near the junction with Ruby Street, NY 27 enters the borough of Queens, but retains the Linden Boulevard name.

Continuing northeast through Queens, NY 27 and Linden Boulevard enter Ozone Park and reach an interchange with Conduit Avenue, where Linden Boulevard ends. NY 27 then continues eastward along the divided Conduit Avenues. This portion of the route becomes a controlled access highway, coterminous with the western portion of Nassau Expressway (NY 878) starting at Cross Bay Boulevard until Aqueduct Road. (When constructed, the portion from Linden Boulevard until what is now Aqueduct Road, was designated Sunrise Highway. This is not to be confused with present Sunrise Highway, which is at the other end of Queens. Sunrise became Conduit at 111th Street, which no longer exists, but is approximately where Aqueduct Road currently crosses over Route 27.)

When the Nassau Expressway splits off, NY 27 continues east along Conduit Avenue and remains a frontage road for multiple exits of the Belt Parkway. The route interchanges with I-678 (the Van Wyck Expressway) a short distance later.

NY 27 remains a frontage road entering Springfield Gardens, crossing multiple exits of the Belt Parkway until entering Laurelton. In Laurelton, the Belt Parkway turns northward while NY 27 continues eastbound as South Conduit Avenue and westbound as Sunrise Highway, but stays a seven-lane divided boulevard (four eastbound and three westbound). The route crosses Francis Lewis Boulevard and south of the Rosedale Long Island Rail Road station; just east of Hook Creek Boulevard, NY 27 enters Nassau County and becomes the Sunrise Highway.

Sunrise Highway begins as a six to eight-lane arterial road in eastern Queens, directly paralleling the Atlantic and Montauk branches of the Long Island Rail Road. It heads east into Nassau County, passing through Valley Stream, Lynbrook, and Rockville Centre on its way to Merrick. There it connects to the Meadowbrook State Parkway by way of an interchange. NY 27 continues to Wantagh, where it has an interchange with the Wantagh State Parkway. One mile (1.6 km) later, the highway has an interchange with NY 135 in Seaford. In East Massapequa, NY 27 passes under the LIRR and ends its stretch through Nassau.