Ambulances forced to ramp amid overcrowding crisis at Adelaide hospitals

South Australia's hospital overcrowding crisis has again reached boiling point, with ambulances forced to ramp outside the new Royal Adelaide Hospital today, 9News can reveal.

Nursing staff have been triaging patients in ambulances outside the Emergency Department, with a page sent out to paramedics asking for extra help this morning.

"We currently have 10 crews on ramp at R.A.H. - three more en route ... longest time frame is now 66 minutes."

Doctors say at one stage today 39 patients who had been admitted to the hospital were still waiting in the Emergency Department.

RELATED: Royal Adelaide Hospital overcrowding 'putting lives at risk'

"This certainly interferes and impairs with our ability to care for patients who are presenting to the ED and are sick," said Dr Thiru Govindan, who is the Chair of the Australian College for Emergency Medicine.

"If you come to work and you're not able to deliver what you are supposed to, then that is immensely frustrating."

Earlier in the week, 9News exclusively reported about safety concerns at the Modbury Hospital, with photos showing patients waiting in corridors to be treated.

Then, we revealed yesterday that some patients at the Lyell McEwin hospital in Adelaide's north were forced to wait more than eight hours to be treated.