Council has warned residents in Northern Eurobodalla who ignore road closure directions will be reported to the police after people were caught driving through the George Bass Drive worksite at Grandfathers Gully.
George Bass Drive at Lilli Pilli was closed in June to allow council to safely undertake major earthworks to realign the road.
Council's senior project engineer George Workman said at least once a day people were either ignoring or not noticing road closure signage and driving through the site, creating a potentially dangerous situation.
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He explained that while the northern end of the worksite was fully blocked, the southern end must remain partially open to allow work vehicles to move in and out.
"In addition to barriers and clear signage, we've also stationed someone at the southern entrance to do traffic control, however we're still seeing one or two cars a day driving through," he said.
"Safety is the primary reason we closed the road and it puts everyone on high alert.
"It's quite difficult to see a small car from behind the wheel of a 72-tonne dump truck with tyres two metres tall.
"We have a responsibility to the safety of workers, so our team will now be reporting anyone ignoring the directions of our traffic controllers direct to the NSW Police.
"We're really appreciative for the cooperation of the vast majority of the community who are doing the right thing and using the detour road available."
Commuters should continue to use Tallgums Way, The Ridge Road and Link Road to access either side of the road closure.
At the same time, council has extended the closure of North Head Drive, south of Moruya Airport until Friday, August 20.
Cooler weather is preventing excess moisture in the road sub-base from drying out, making the road unsuitable for sealing.
Commuters should continue to use the Princes Highway/Broulee Road detour.