Overview
The Northern State Parkway forms the northern tier of Long Island’s parkway network, running 26 miles from its junction with the Grand Central Parkway in Queens to Veterans Memorial Highway in Hauppauge, Suffolk County. Carrying approximately 100,000 vehicles per day, it serves as the main commuter artery for residents of Long Island’s north shore communities — Manhasset, Westbury, Plainview, Commack, and Hauppauge — providing access to the Grand Central Parkway and ultimately to the Triborough Bridge and New York City.
Like its sister road to the south, the Northern State Parkway was a Robert Moses project, conceived as part of his sweeping Long Island parkway network in the 1920s. Moses intended it as a scenic leisure corridor linking northern Nassau County communities to Caumsett State Park and other north shore preserves. Construction proceeded in segments through the 1930s and 1940s, with the Suffolk County extension to Hauppauge completed in the 1960s. The parkway’s stone bridges, broad medians, and landscaped roadside reflect the original aesthetic vision, even as the surrounding communities have grown into dense suburban sprawl that the designers never anticipated.
The Northern State Parkway intersects the LIE at Interchange 40 and connects to the Meadowbrook and Wantagh Parkways heading south. The Bethpage State Park entrance at Exit 35 is a major traffic generator during spring and summer, as Bethpage Black — host of multiple U.S. Open golf championships — draws thousands of spectators and golfers on peak days.
Commuter Patterns and Peak Hours
The Northern State Parkway carries its heaviest volumes during weekday AM and PM commute windows. Westbound AM peak traffic runs from 7:00 to 9:30 AM as commuters head toward the Grand Central Parkway and the Triborough Bridge. The eastbound PM peak runs from 5:00 to 7:30 PM. These peaks are more pronounced than on the LIE for the parkway’s length because the Northern State serves a predominantly residential corridor, meaning rush-hour volume is less spread across the day and peaks more sharply.
During the US Open golf tournament at Bethpage State Park — when held at Bethpage Black, which has hosted the championship multiple times — the Exit 35 area experiences event-level disruption comparable to a major stadium or arena. Temporary traffic management plans involving state troopers, variable message signs, and parking overflow management are deployed by NYSDOT, but the surrounding network in Bethpage and Farmingdale becomes severely congested on tournament days.
Alternative Routes When NSP Is Congested
- Jericho Turnpike (Route 25): Parallel surface road immediately north of the Northern State through most of Nassau County. Serves the same communities with traffic signals at all major intersections.
- Long Island Expressway (I-495): The primary alternative for east-west travel if the Northern State is closed or severely congested. Vehicles prohibited from NSP due to height or commercial restrictions should use the LIE.
- Old Country Road: A mid-county east-west surface alternative for trips wholly within Nassau County that don’t require highway speeds.
Dangerous Sections
Exit 35 — Bethpage State Park Road (Farmingdale/Bethpage area): During golf season (April through October), the Exit 35 interchange handles surges of park-bound traffic with limited ramp capacity. The on-ramp geometry is tight, and park visitors unfamiliar with parkway merging create hazards. US Open weeks see traffic conditions on par with major event disruptions.
Exit 40 — Round Swamp Road (Old Bethpage): This is the last off-ramp before the NSP transitions to the LIE. Drivers who miss their exits often brake abruptly or attempt last-second lane changes, contributing to rear-end and sideswipe crashes in this segment.
Towns Along This Route
Current Conditions
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Recent Incidents
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Accident Statistics
NYSDOT data show 1,200–1,600 annual crashes on the Northern State Parkway. Single-vehicle run-off-road crashes and rear-end collisions comprise the majority. The Nassau County segments see higher crash frequency; the Suffolk segments see higher crash severity.