What Happened
The New York State Department of Transportation will shut the ramp from westbound State Route 454 (Veterans Memorial Highway) to the westbound Northern State Parkway starting at 9 p.m. Tuesday, August 25, 2026. The ramp stays closed until 5 a.m. Wednesday, August 26. The closure covers eight hours and affects drivers in the Town of Smithtown, Suffolk County.
Crews need the ramp down to complete guiderail repairs at the interchange, according to a travel advisory published by LongIsland.com. The NYSDOT flagged the work as weather-dependent; conditions could push the schedule.
Westbound Route 454 drivers who normally use the ramp should stay on Route 454 past the interchange, turn onto southbound Lincoln Avenue, and then follow Cedar Street/Parkway Drive North back to the westbound Northern State Parkway. That is the only detour NYSDOT issued with the advisory.
Location & Road Context
The closure sits at the Northern State Parkway’s interchange with Route 454 in Smithtown, one of the primary eastward feeders onto the parkway for commuters moving through central Suffolk County. Drivers using this ramp during the overnight window will add at least one turn sequence — Lincoln Avenue south to Cedar Street/Parkway Drive North — before regaining westbound Parkway access.
According to Long Island Traffic’s incident registry, the Northern State Parkway has logged 20 recorded incidents in the past 30 days and 71 so far in 2026, making this closure the 20th incident on the corridor within that window. The most recent prior fatal crash on the Parkway occurred August 11, 2026. The overnight timing — 9 p.m. to 5 a.m. — keeps the work outside the morning and evening peak periods, limiting the effect on rush-hour volume.
Broader Impact
The NYSDOT advisory notes that all construction activities are weather-dependent and subject to change. Drivers planning to use the westbound Route 454 on-ramp to the Northern State Parkway before 5 a.m. Wednesday should check 511NY or call 511 for any schedule changes before departing. A separate overnight ramp closure on westbound Sunrise Highway in the Town of Southampton was also active August 24, 2026, part of an active week of overnight construction advisories across Suffolk County.