A $300,000 project to improve erosion and sediment control just north of Woodburn will start on October 19.
Roads and Maritime Services advises motorists maintenance work will include drainage structures beneath the Pacific Highway.
The project is to be carried out about 2.6 kilometres north of Woodburn and aims to provide a safer, stronger and longer lasting road.
Work to be carried out includes erosion and sediment control, removal of silt build up, revegetation and concrete strengthening work on the drains under the road.
Work hours will be on weekdays from 7am to 6pm and Saturdays from 8am to 1pm, with the project expected to be complete within six weeks, weather permitting.
Motorists are advised short lane closures will be in place for up to five minutes so work can be carried out safely and should follow all directions from traffic control.
Residential access will be maintained at all times.
For the latest traffic information call 132 701, visit livetraffic.com or download the Live Traffic NSW App.