"I have been to two fatal accidents at that location," the president of the south-eastern sub-branch of the Health Services Union said.

Now, he wants drainage on the stretch of Princes Highway where his colleagues overturned on the morning of Monday, March 18, addressed - and a divided dual carriageway to the Victorian border.

Witnesses told police the ambulance overturned while travelling below the speed limit on the "mad mile", south of Batemans Bay in wet conditions.

"I heard the initial report of the two paramedics calling for assistance," Mr Grayson said.

"When these things are close to home, you get a shiver up your spine.

"Paramedics are responding to emergencies and the last thing we want is to be having our own emergency.

"Environmental factors were to blame. That stretch of road is notorious. Water just sheets across."

Mr Grayson said he had attended several crashes there where cars had run off the road.

"Drainage seems to get clogged and water and sediment washes across the road," he said.

"Especially when it has not rained for a while, debris, fuel and oil make a dangerous mix that leads to cars easily losing traction while driving in a normal manner.

"We would like the RMS to make sure that section of road is kept clear and they look at the drainage and the camber on that corner.

"We know it is a black spot and they could do something now."

Mr Grayson goes further: he has backed this masthead's FIX IT NOW campaign for a safer highway and called on the federal government and Labor Opposition to do so too.

"The paramedics union supports the FIX IT NOW campaign," he said.

"Too often we are asked to respond to significant incidents that impact on local families and the community.

"That takes a toll on paramedics, the volume of the tragedy they see.

"The highway has been grossly underfunded, given it is a growth area."

He said the new Batemans Bay bridge would bring more trucks to an unforgiving highway.

"We have concerns larger trucks will be in the area without adequate shoulders or width of road, which leaves no room for error," he said.

The day after the ambulance overturned, a vehicle overturned north of Narooma near where two head-on collisions occurred in 2018. Another vehicle overturned there on March 6.

"The area just north of Narooma is another area of concern due to the camber, water pooling and not enough room for error," Mr Grayson said.

"It is disappointing that the Princes Highway has not received funding upgrades to provide a safe carriageway.

"Having worked in this area for 20 years, there has been little change in providing a dual carriageway to the border, with only relatively small areas having received funding to straighten deadly sections of the road.

"The paramedics believe the funding required will need both federal and state support.

"Whilst there has been some commitments from the state level, we would like to hear from the federal government and the Opposition to ensure there is adequate funding to provide a safe road network for the South Coast."

The FIX IT NOW campaign has secured a bi-partisan statement of support from both major parties, but no firm funding commitment.

Mr Grayson said repairs to the Kings Highway were welcomed.

"Most of the Clyde has been resurfaced, which seems to have reduced the number of accidents there," he said.

"We still believe there are inadequate overtaking places on both the Kings and Princes Highways."

Meanwhile, he urged everyone to drive more slowly in the rain.

"The limit is there for maximum speed in good conditions," he said.