Areas of categorisation
The washroom gender debate has exploded quite rapidly. Something we've always taken for granted has suddenly become quite a lightning rod. While one side or the other debates what people need to be protected from, I think there's really one major thing that most everyone is afraid of encountering when going to any washroom. Numbering them would massively help save me from running into something I'd really rather avoid. I would benefit from this every single time. Also, in case of a conflict, go with the HIGHER number.