Route 111 in Smithtown will be partially closed for a repaving project starting Monday, the state Department of Transportation said.

Repaving will cover a two-mile stretch between Route 347 and Main Street, or Route 25/25A, with much of the construction during off-peak and nighttime hours, the agency said.

Between 10 a.m. and 3 p.m. and/or 10 p.m. and 6 a.m., Route 111 travel lanes in both directions will be shifted or closed Monday through Friday as needed to accommodate construction operations, the agency said.

At least one travel lane in each direction will remain open at all times; multiple lane closures will take place mostly during nighttime hours.

The resurfacing is part of a $7.8 million agency repair to Long Island’s heavily traveled roadways and is designed to improve the safety of motorists, the agency said.

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Real-time travel information is available by calling 511 or visiting 511NY.org, the state’s official traffic and travel information source. Also, information can be found at informny.com.

Mobile users also can get DOT information on Twitter at @NYSDOTLI or at Facebook.com/NYSDOT.