What Happened
The New York State Department of Transportation will begin overnight lane closures on State Route 25 (Jericho Turnpike and Main Street) between Kings Park Road in the Town of Smithtown and State Route 111 in the Village of the Branch starting Monday, September 14, 2026, according to a NYSDOT advisory published by LongIsland.com. The advisory was issued Thursday, September 10.
Closures will run weeknights from 10 p.m. to 6 a.m. for approximately two months to allow a pavement renewal project. Up to two lanes in either direction may be taken down during any given overnight window. NYSDOT confirmed that at least one lane of traffic will remain open in both directions at all times.
Electronic message signs posted near the work zone will carry real-time closure information, per the LongIsland.com advisory. All construction activities are weather-dependent and subject to change based on conditions. Motorists should verify closure status via 511NY before heading out on affected weeknights.
Location & Road Context
State Route 25 runs the length of Long Island’s North Shore communities and carries heavy commuter and commercial traffic through central Smithtown. The segment from Kings Park Road to State Route 111 passes through a dense commercial and residential stretch where lane drops during overnight hours can still create backups for late-shift and early-morning drivers.
According to Long Island Traffic’s incident registry, Route 25 (Jericho Turnpike) has recorded 6 incidents in the past 30 days and 29 so far in 2026. The most recent prior fatal crash on the corridor occurred July 16, 2026. Drivers navigating the work zone should expect enforcement activity; a Suffolk County man faces aggravated vehicular homicide charges after a September 9 work zone crash that killed a highway worker.
Broader Impact
Drivers who use Route 25 through Smithtown late at night should plan for the full eight-week run, 10 p.m. to 6 a.m. weeknights from September 14 through approximately mid-November. NYSDOT directs motorists to call 511, visit 511NY.org, or use the free 511NY mobile app for up-to-date lane status before travel.