University Hospital Waterford had 59 instances in a month where ambulances were delayed for up to three hours.
The delays came from the build-up in the busy emergency departments meaning the ambulances couldn't leave until the hospital for their next call.
While there is a 30 minute turnaround target set by the HSE, for the month of September alone 290 ambulances were delayed in 7 hospitals.
Cork University Hospital was the worst affected with 87 delays.
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