At least 14 ambulances can be seen waiting outside a hospital's A&E unit in worrying footage.
Jonathan Roe, 54, from Kinnersley, near Worcester, claimed that every one of the vehicles was filled with patients and paramedics.
He recorded the shocking scene when he visited his 93-year-old uncle in Worcestershire Royal Hospital at 5.30pm on December 3.
Mr Roe, who runs building sites, said it was a "poor use of resources" and called on the hospital to take action.
He told The Mirror: "It's like having lots of holes to dig on a worksite but half the digger drivers can't drive for some reason. You can't be having that.
"I didn't film all of the ambulances, I think there were 18 in total that were all full with patients and staff.
"You can't have a couple million pounds worth of ambulances stuck outside the hospital just because you don't have enough space inside.
"I think it's a poor use of resources. The cost is immense.
"There were more ambulances parked in a different area too but they had disembarked."
He added that one ambulance driver suggested to him that crews were being called in from outside of Worcestershire.
Mr Roe said he was surprised to see so many emergency vehicles at 5.30pm - a time he thought would be a comparatively quiet for A&E.
"I don't know what is causing it (the delays)," he said.
"Worcestershire Royal Hospital is not an old hospital. It should have been designed fit for purpose.
"Maybe Covid has thrown a spanner in the works. They can provide temporary Covid hospitals so why can't they provide something similar for A&E's just to get the ambulances back on the road?
"Why don't we build an overflow A&E?"
The Mirror asked Worcestershire Acute Hospitals NHS Trust, which runs the hospital, what was causing the delays but we did not receive an answer.
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Data for Worcestershire Acute Hospitals NHS Trust shows that 38 per cent of ambulance patients waited more than 30 minutes to be handed over to A&E staff between November 29 and December 5, according to the BBC's NHS tracker.
The average figure for England was 23 per cent.
Matthew Hopkins, chief executive of the trust, said: “Staff across our emergency departments and partner NHS services are working incredibly hard to ensure patients get the help they need, as quickly and safely as possible in the face of unprecedented demand.
"The NHS is working on its 10-point action plan to support hospitals, and anyone who needs medical help should come forward through the appropriate route for non-emergencies, such as NHS 111, and urgent treatment centres, then staff can help with the best option for your care.”
