People heading to and from Appin and Campbelltown outside peak hours will need to find an alternate route next week.
Roads and Maritime Services will be closing Appin Road between Appin and the M1 Princes Motorway for three days next week.
From Tuesday to Thursday Appin Road will be closed from 9am to 3pm.
However, buses will continue to travel on their routes between Wollongong and Campbelltown.
People with a booking at the Cataract Scout Park off Baden Powell Drive will be given access by traffic controllers on site.
Road crews will be carrying out maintenance work along Appin Road, including clearing gutters and drains, trimming vegetation and removing dead or dangerous branches.
Detours for light vehicles will be in place via Wilton Road, Picton Road and the motorway, adding around 10 minutes to travel times.
Detours for vehicles over 12 tonnes and 15 metres will be via Hume Motorway, Picton Road and the motorway, adding around 15 minutes to travel times.
Source: Illawarra Mercury