A new collective noun?

A 'Queue' of ambulances. They seem to gather in groups nowadays whereas, in the past, they used to be quite singular creatures.
I dropped Marlane off at Gloucestershire Royal Hospital to take her Mother, Betty, F.m.i.l., for a scan to check her legs over after we had a home visit from the Doctor. She's having difficulty walking nowadays, well she will be 93 in 2 days time!
On the way out I noticed the queue and counted 15 (FIFTEEN) ambulances in all. The ones in the photo are along the area of A&E, the rest were around the corner, to the right, at the Tower Building.