Wet weather has delayed works on Moruya's North Head Drive and Eurobodalla Council advised the section past the airport will stay closed to traffic for another three weeks.
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The road was closed in early May for an expected five weeks for work on the Garlandtown Bridge and adjacent sections of the road and will be closed until Friday, July 23.
Director of infrastructure Warren Sharpe said the delay was outside of council's control but the upgrade was needed to improve road safety and accommodate future capacity.
"We can't command the weather, and we'll reopen North Head Drive to traffic as soon as it is safe to do so," Mr Sharpe said.
"In the meantime, commuters should continue to access the Moruya Airport, the racecourse or the speedway using the Princes Highway and Broulee Road, which will add a few extra minutes to their travel time to and from Moruya."
The road is closed from just south of the Moruya Airport intersection to just east of Quarry Park Reserve.
The $2.8 million road and bridge upgrade involves widening Garlandtown Bridge to provide two 3.5 metre wide lanes with a two metre shoulder on both sides and strengthening 1.4 kilometres of road pavement.