Overview
The Sagtikos State Parkway is a 14-mile north-south connector in central Suffolk County, linking the Long Island Expressway at Exit 53 in the north to the Southern State Parkway in the south near Bay Shore. Together with the Robert Moses State Parkway (which continues south from the Southern State junction to Fire Island), the Sagtikos forms a complete north-south corridor through western Suffolk County.
The parkway takes its name from the Sagtikos River and the historic Sagtikos Manor — one of Long Island’s oldest surviving estates, built in 1697 and visited by George Washington during his 1790 presidential tour of Long Island. The manor still stands as a museum and historic site just west of the parkway.
The Sagtikos carries approximately 55,000 vehicles per day, a volume that reflects its dual role as a commuter connector between the LIE and Southern State corridors and a recreational access road to Robert Moses State Park and Fire Island National Seashore. The commuter function is heaviest during weekday AM and PM peaks; the recreational function dominates summer weekends, when the Sagtikos-Robert Moses corridor is one of the busiest in the region.
The surrounding communities of Babylon, Dix Hills, and Brentwood are among the most densely populated areas of western Suffolk County, and the parkway is deeply embedded in their daily transportation patterns. Dix Hills, one of Long Island’s highest-income communities, borders the parkway’s central section, while Brentwood to the east is one of the most economically diverse communities on Long Island.
The Robert Moses Causeway Connection
The Sagtikos State Parkway’s southern end connects to the Robert Moses State Parkway, which continues south across the Robert Moses Causeway over the Great South Bay to Fire Island. Together, the two parkways form a continuous limited-access corridor from the LIE to the Atlantic Ocean — one of the few such corridors on Long Island that reaches a barrier island beach without a single traffic signal or at-grade intersection along the way. This design, specifically engineered by Robert Moses, allows theoretically unobstructed access from central Long Island to the Atlantic coast.
Robert Moses State Park at the southern end of the corridor is one of Long Island’s most heavily visited destinations, featuring beaches, a marina, and the historic Fire Island Lighthouse. The park is distinct from Jones Beach to the west in that it also serves as the western access point for Fire Island National Seashore, the 26-mile barrier island managed by the National Park Service. The Sagtikos corridor’s volumes spike significantly on summer weekends when Fire Island day visitors and renters — and their vehicles, which cannot be brought onto Fire Island proper and must park at the causeway lot — use the parkway and causeway in large numbers.
The surrounding community of Bay Shore serves as the main eastern gateway to Fire Island, with ferry services to Ocean Beach, Ocean Bay Park, and other Fire Island communities departing from the Bay Shore marina, accessible from the Sagtikos corridor.
Dangerous Sections
LIE interchange (Exit 53, Bay Shore/Brentwood area): The merger of the Sagtikos northbound with the LIE mainline is among the highest-crash locations in western Suffolk County. The ramp geometry requires merging vehicles to reach LIE speeds (55+ mph) in a short distance while monitoring fast-moving mainline traffic. NYSDOT crash records consistently flag this interchange.
Southern State junction (Bay Shore): The southern terminus interchange handles simultaneous flows between the Sagtikos, Southern State, and Robert Moses Causeway. Summer beach weekends produce the worst conditions, with southbound traffic backing well onto the parkway.
Towns Along This Route
Current Conditions
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Recent Incidents
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Accident Statistics
Sagtikos Parkway crash data reflect both commuter and seasonal recreational patterns. Weekday crash peaks align with LIE-interchange volumes; summer weekend peaks align with Fire Island and Robert Moses beach access traffic.