On: North Yorkshire Council to phase out apostrophe use on street signs

[Caligatio]

I actually had to look this up, it depends if the possessive form is actually said with one or two Ss. For instance, it's Jones's and Bridges'.

https://grammar.collinsdictionary.com/easy-learning/what-are... https://www.sussex.ac.uk/informatics/punctuation/apostrophe/...