A main route through Havenstreet to Binstead looks set to be shut for another two weeks.
Southern Water is continuing to carry out repairs on Newnham Road, meaning diversions and delays for drivers.
The route has been closed since November 28.
Now, the utility firm has said it is expecting another couple of weeks of disruption.
A spokesperson for the company said they hope works will be completed by Christmas.
Repairs are underway on a broken sewer near Newnham Lane.
Drivers travelling from Havenstreet to Binstead are being diverted along Stroud Wood Road.