About Route 25A
Route 25A — officially the North Shore Road and signed as NY 25A — is Long Island’s scenic, historic counterpart to the high-speed expressways and parkways that carry the bulk of the island’s traffic. Running roughly 72 miles from the Queens / Nassau border at Great Neck east to NY 25 (Main Road) in Calverton, Route 25A is predominantly a two-lane, undivided arterial that threads directly through historic village centers, past harbors and estuaries, and across the rolling Gold Coast terrain that has drawn wealthy estate-builders to the North Shore since the Gilded Age. It carries on the order of 25,000 vehicles per day on its busier village segments — a fraction of the LIE’s volume, but on a road geometry never designed for modern speeds or turning conflicts.
A colonial road, modernized
Route 25A is one of the oldest continuously traveled corridors on Long Island. It traces long portions of the colonial-era North Country Road — part of the old King’s Highway post-road network laid out in the late 1600s to connect the North Shore’s earliest European settlements. As New York standardized its touring-route numbers in the 1920s and 1930s, the North Shore alignment was bundled together and signed as NY 25A, a companion to NY 25 (Jericho Turnpike / Middle Country Road) running parallel to the south. The colonial bones still show: the road bends to follow harbor edges and old village greens rather than the straight, graded geometry of a purpose-built highway.
Route geometry, west to east
From its western end at the Queens / Nassau border near Great Neck, Route 25A runs east through Port Washington, Roslyn (with its landmark clock tower and historic district), and the Glen Cove / Greenvale area before reaching Oyster Bay, home to Theodore Roosevelt’s Sagamore Hill. Crossing into Suffolk County, the road passes the Cold Spring Harbor narrows — the shoulder-less stretch carved into the hillside above the harbor, directly past Cold Spring Harbor Laboratory — and continues through Huntington village, where it briefly overlaps Route 110. East of Huntington it runs through Centerport, Northport, and Fort Salonga (where it is locally known as Fort Salonga Road), then through Smithtown and St. James into Stony Brook village near the SUNY flagship campus and the Nicolls Road corridor. From there it climbs through Setauket, descends into Port Jefferson village (and its Bridgeport ferry terminal), and finishes its run east through Mount Sinai, Miller Place, Shoreham, and Wading River to its terminus at NY 25 in Calverton.
Jurisdiction and patrol
Route 25A is a NYSDOT-maintained state route, but unlike the LIE, no single agency owns its patrol. In Nassau County, the Nassau County Police Department covers the corridor. In Suffolk County, the Suffolk County Police Department patrols through its 2nd, 4th, and 6th Precincts, covering the towns of Huntington, Smithtown, and Brookhaven. Incorporated villages along the route — most notably Northport Village — operate their own police forces with primary jurisdiction inside village limits. NYS Police Troop L assists on unincorporated state-route segments and frequently takes the lead at serious crashes. This patchwork means crash reporting on Route 25A is spread across more agencies than on a limited-access highway.
Speed limits and character
Posted speed limits on Route 25A swing widely. Through the village centers of Huntington, Northport, Stony Brook, and Port Jefferson the limit is typically 30–40 mph, dropping into walkable, shop-lined main streets with crosswalks, on-street parking, and constant turning movements. On the more open or divided stretches between villages the limit rises to 45–55 mph. The corridor’s defining safety problem is this constant transition: drivers move from a fast open segment into a 30 mph village core with little warning, while local traffic turns across the through lanes at unsignalized cross streets. The scenic appeal that makes Route 25A beloved — harbor views, tree canopy, historic streetscapes — is the same geometry that leaves no margin for error.
Dangerous Sections
Route 25A’s crash profile is dominated not by high-speed expressway pileups but by head-on collisions, run-off-road crashes, and turning-movement and pedestrian conflicts on its two-lane village segments. The following stretches are documented hot spots based on NYSDOT crash data and Long Island Traffic’s running corpus of accident reports.
Cold Spring Harbor narrows (Route 25A / Harbor Road area): This two-lane section is carved into the hillside above Cold Spring Harbor with minimal shoulder. Any disabled vehicle creates an immediate secondary-crash risk, the grade and harbor views pull driver attention off the road, and ice accumulates here before it does on flatter sections. The proximity of Cold Spring Harbor Laboratory and waterfront parking adds frequent pedestrian and pull-in/pull-out movements.
Route 110 / Main Street junction (Huntington Village): Where Route 25A overlaps and crosses Route 110 in downtown Huntington, the corridor absorbs one of the North Shore’s busiest commercial-traffic loads. Heavy pedestrian volume, dense on-street parking, and the merge of two major arterials produce frequent low-speed turning and rear-end crashes, and pedestrian conflicts at the village crosswalks.
Nicolls Road intersection (Stony Brook): The junction of Route 25A and Nicolls Road (CR 97) funnels Stony Brook University and medical-center traffic onto the North Shore arterial. The high volume of student and commuter turning movements against 25A through traffic makes this one of the busier signalized conflict points in the corridor’s Suffolk stretch.
Setauket–Port Jefferson grade (Route 25A / Main Street): The descent into Port Jefferson village from the Setauket area includes steep grades that turn hazardous in snow and ice, feeding directly into the village’s narrow, congested center. Summer ferry and downtown traffic compound the risk, stacking vehicles on a grade where stopping distances are already compromised.
Eastern two-lane stretch (Miller Place & Shoreham): Through the Brookhaven communities of Mount Sinai, Miller Place, and Shoreham, Route 25A is a fast, largely unlit two-lane road with limited separation between traffic and vulnerable road users. This segment has seen repeated severe pedestrian and bicycle crashes — including the 2026 death of a 14-year-old Miller Place cyclist — as well as multi-vehicle collisions like the three-vehicle Shoreham crash that left one victim airlifted.
Towns and Communities Along the Route
Route 25A passes through (or borders) the following Long Island towns and hamlets, listed roughly west-to-east:
- Great Neck (Nassau)
- Port Washington (Nassau)
- Oyster Bay (Nassau)
- Huntington (Suffolk)
- Northport (Suffolk)
- Smithtown (Suffolk)
- Stony Brook (Suffolk)
- Port Jefferson (Suffolk)
Each town profile carries its own crash-frequency data, hospital and emergency-services list, and the recent accident archive filtered to that municipality.
Recent Editorial Coverage
Recent Route 25A reporting from the Long Island Traffic data desk:
- Three-Vehicle Crash on Route 25A in Shoreham Leaves One Airlifted — a violent multi-vehicle collision on the eastern two-lane stretch
- Miller Place Boy, 14, Dies Weeks After Route 25A Bicycle Crash — the death that put the corridor’s pedestrian and cyclist risk in the spotlight
- Community Rallies Behind Miller Place Teen Critically Injured in Route 25A Crash — the initial report on the Miller Place crash
- Pizza Event Raises $6,500 for Miller Place Teen Hurt in Route 25A Accident — the community fundraiser that followed
For the complete Route 25A accident archive, see /accidents/ and filter by road.
Accident Statistics
Route 25A’s crash totals are far lower than the LIE’s by raw volume, but its per-mile injury severity on the two-lane village and rural segments is notable. NYSDOT Motor Vehicle Crash data and NY Open Data crash records indicate the corridor sees on the order of 1,200–1,600 reported crashes annually across its 72-mile length, concentrated in the village centers (Huntington, Northport, Stony Brook, Port Jefferson) and at unsignalized cross-street intersections. Turning-movement and head-on crashes dominate the two-lane sections, while rear-end and pedestrian crashes cluster in the dense village cores. Winter months see a disproportionate share of run-off-road crashes on the hilly, shoulder-less stretches such as the Cold Spring Harbor narrows and the Setauket–Port Jefferson grade, where ice forms early and plowing priority trails the expressways. Night crashes on the unlit eastern segments through Miller Place and Shoreham are over-represented in the severe-injury and fatal categories. These figures are estimates drawn from NYSDOT / NY Open Data crash datasets and should be read as ranges rather than exact annual counts.
For the most current picture of conditions on the road right now, the Live Accident & Traffic Reports section above pulls directly from 511NY and our own ingestion pipeline.
