A man was airlifted to Stony Brook University Hospital after his car overturned early Monday on Nicolls Road in Bayport, police said.

The one-car accident occurred at 2:41 a.m., Suffolk County police said.

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Police closed Nicolls between Montauk Highway and Church Street until 3:45 a.m.

The extent of the injuries was not known, but police said the victim was "alert and conscious" during the airlift -- and said the injuries were not believed to be life-threatening.