Notice from NYSDOT: Travel Lane Shifts And Off-Peak Closures On Route 347 In Nesconset Beginning August 1st

Motorists are advised that travel lane shifts and off-peak day and night closures of NY Route 347 between Terry and Gibbs Pond roads are set to begin Monday, August 1 in Nesconset in the Town of Smithtown, Suffolk County.  

To begin construction on the 1.2 mile NY Route 347 Safety, Mobility and Environmental Improvement Project in this area, eastbound and westbound travel lanes will be shifted toward the center median to accommodate work on the north and south sides of the roadway.  In addition, the current median opening at Garfield Court between Lake Avenue and Gibbs Pond Road, and the opening at the Town of Smithtown Highway Department west of Southern Boulevard will be permanently closed for the safety of motorists.  Following the lane shifts, intermittent single lane closures will be in effect Monday through Friday between 10 a.m. and 3 p.m. 

Work requiring more than a single lane closure in each direction will take place at night between 10:00 p.m. and 6:00 a.m. Monday through Friday nights, weather permitting. 

These travel lane restrictions are needed as part of the $36.2 million NYS Department of Transportation project to improve motorists’ safety and mobility and transform the roadway into a modified boulevard and suburban greenway for 15 miles through the towns of Smithtown, Islip and Brookhaven.  Motorists will be warned in advance of the closings via electronic road signs but should plan to take alternate routes to avoid delays.  Emergency service providers, residents, businesses, and local officials are being notified of these NY Route 347 travel lane closures. These night closures are weather dependent and may be canceled or postponed. 

For real-time travel information motorists should call 511 or visit, New York’s official traffic and travel information source.   Motorists may also obtain travel information from the INFORM Transportation Management Center cameras at

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The New York State Department of Transportation appreciates the patience and cooperation of businesses, motorists and local residents during this important road improvement project.