Sagtikos State Parkway

Sagtikos State Parkway
Map of western Suffolk County with the Sagtikos State Parkway highlighted in red
Route information
Maintained by NYSDOT
Length:	5.14 mi (8.27 km)
Existed:	September 29, 1952 – present
History:	Constructed 1949–1952
Restrictions:	No commercial vehicles
Major junctions
South end:	Southern State Parkway / Heckscher State Parkway in West Islip
	I-495 in Brentwood
North end:	Northern State Parkway / Sunken Meadow State Parkway in Commack
Location
Counties:	Suffolk
Highway system
New York Highways Interstate U.S. State Reference Parkways

The Sagtikos State Parkway, also known as the Sagtikos or Sagtikos Parkway, known colloquially as "the Sag" is a 5.14-mile (8.27 km) north–south limited-access parkway in Suffolk County on Long Island, New York, in the United States. It begins at an interchange with the Southern and Heckscher state parkways in the hamlet of West Islip and goes north to a large cloverleaf interchange with the Northern State Parkway in the town of Smithtown, where the Sagtikos ends and the road becomes the Sunken Meadow State Parkway. The parkway comprises the southern half of New York State Route 908K (NY 908K), an unsigned reference route, with the Sunken Meadow State Parkway forming the northern portion. Commercial vehicles are prohibited from using the Sagtikos State Parkway, a restriction that applies to most parkways in the state.

The parkway was proposed to help bridge a gap in the eastern part of the Long Island Parkway system. Construction began in 1949 with the opening of an interchange between Bay Shore Road and the Southern State Parkway. Work on the parkway itself began the following year, with plans calling for connections to three spurs: the Captree State Parkway (now Robert Moses Causeway), the Sunken Meadow Spur (Sunken Meadow State Parkway), and the Heckscher Spur (Heckscher State Parkway). The parkway was completed in 1952, closing the highway loop on Long Island. In 2001, a study by the New York State Department of Transportation (NYSDOT) called for the Sagtikos State Parkway to be widened to include new bus and carpool lanes from end to end.