DARIEN - Expect a rough ride and some lane closures on Route 1 for about a month.

That’s because from the Stamford border to the Norwalk city line, Route 1 will be undergoing a nighttime milling and resurfacing project.

Work on resurfacing the nearly four-mile stretch of the Boston Post Road will begin Thursday night. The work will end on Oct. 13.

Work hours are from 8 p.m. to 5 a.m., Sundays through Thursdays.

Milling prepares the road surface for new pavement by removing part of the exisiting asphalt. A heavy-duty milling machine removes the asphalt that is ground up and recycled as aggregate in fresh pavement.

The method removes surface irregularities on the road, such as bumps and depressions, and extends the life of the pavement.

Until the fresh layer of asphalt is laid later this month, milling will leave a rough road surface.

The milling segment the project will continue through Oct. 6. The resurfacing is planned from Sept. 27 and end Oct. 13.

Motorists can expect lane closures on Route 1 from .10 mile north of Stamford border to Norwalk town line. Traffic control personnel and signing patterns will be utilized to guide motorists through the work zone.