Although Liverpool's trams were equipped for double-ended operation (and the majority of termini were stub ends), IIRC there were several spots where turning circles / balloon loops were available.
- Pier Head, the main city tram terminus, was laid out as three adjacent balloon loops (imaginatively named North, Central and South) to avoid mass swapping of trolley poles in a very busy location.
- Page Moss terminus on route 40 (from where the last Liverpool tram in regular public service departed). I've read that often the trams would be reversed using the crossover at Page Moss rather than running around the balloon loop. Apparently, the controllers on the Liners had a tendency to overheat, and changing ends to a 'fresh' driving controller minimised chance of problems on the way back to the Pier Head.
- On South Boundary Road close to the end (but not the regular dead-end terminus) of the Kirkby line. Presumably this was to cater for heavy traffic to/from Kirkby Industrial Estate at shift change time (maybe a legacy of the WW2 ordnance factory thereabouts)
Across the Mersey, I think the Wallasey Corporation trams also terminated in a balloon loop at the Seacombe ferry terminal.