SA ambulance ramping at record levels

Ambulances have been waiting an average of more than an hour at some Adelaide hospitals. (AAP)

Ambulance ramping has reached record levels in South Australia with the delays increasing pressure on the state's already stretched public hospital network.

The latest figures show ambulances were ramped outside hospitals for a total of 3838 hours in June, a 12.5 per cent increase on the previous high of 3412 hours the previous month.