Milton businessman Grant Schultz first spotted the rising lump in December following heavy rainfall.

Over the past month he has seen the road rise to about 400 millimetres along a two-metre stretch of the shoulder, while the surface near the centre of the lane has collapsed and become lumpy, including the growth of a steep lip on an unopened pot hole.

Mr Schultz fears there’s potential for a fatal collision.

“If you hit the mound, that’s enough to roll a car most definitely,” he said.

“I think this is dangerous particularly at night or if drivers are not familiar with the area.

“You don’t want that risk of pushing a car into oncoming traffic, there is still a potential for fatal.”

Mr Schultz said he has reported the problem to Shoalhaven City Council’s Snap Send Solve app.

A Shoalhaven City Council spokesperson said it plans to commence road repairs on Matron Porter Drive on Tuesday, 15 January weather permitting.

“Council regularly undertakes condition assessments of the roads and data collected is used to determine which roads are programmed for repair,” the spokesperson said.

“To keep the road network trafficable, Council crews undertake reactive maintenance repairs to fix defects in the pavement, like potholes.”

Council encourages residents to report any maintenance concerns, including potholes, via council@shoalhaven.nsw.gov.au or by contacting our Customer Service team on 4429 3111 or by visiting the Nowra or Ulladulla Centres.