Patients in 24 ambulances were reportedly left waiting for up to three hours outside of the Royal Adelaide Hospital’s emergency department on Monday.

Patients were forced to wait in the back of ambulances due to a full emergency department at the hospital.

The backlog reportedly also led to longer wait times for those waiting for an ambulance to arrive, with the state’s Labor opposition saying that one person waited more than 45 minutes on Monday because of the reported ramping.

Labor’s Chris Picton told The Advertiser that the average ramp time for an ambulance is one hour and 48 minutes.

Reports of the ramping follows news that two of Adelaide’s hospitals rank the worst in the nation for hospital wait times.

The RAH and the Lyell McEwin Hospital ranked worst and second-worst in the nation, respectively, for time taken to see and treat patients in emergency departments.