A stretch of Route 347 in Hauppauge will be partially closed over a two-week span as part of a $30.5 construction project, the state Department of Transportation said.

Overnight closures leaving a single travel lane on westbound Route 347 between Mount Pleasant Road and Route 111 began Monday and run until Thursday, the agency said. A second closure runs from Tuesday, Sept. 2, to Friday, Sept. 5.

Each night from 9 p.m. to 6 a.m. the roadway will be restricted to one-lane of westbound travel, the agency said in a news release.

Traffic will not be subject to lane restrictions the Friday before the Labor Day weekend or on Labor Day, officials said.

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The closures are needed as part of the $30.5 million, Design-Build, NY Route 347 Safety, Mobility and Environmental Improvement Project currently under construction, the agency said.

The project is a second in a series of NY Route 347 corridor projects planned to improve safety and to reduce travel delays "by transforming NY Route 347 into a modified boulevard and suburban greenway for 15 miles through Smithtown, Islip and Brookhaven," the agency said.

Up-to-date traffic and travel information is available by calling 511 or visiting 511NY.org. Motorists also can find information at informny.com and on their hand-held communication devices at informny.mobi.