If someone that needed it that was handi-capped,I would just wait for a regular bathroom stall to be open. I am not being discriminative(is that even a word, lol) I just think if the people are handi-capped need the bathroom more and it'd be rude to use it if they were around. Just out of respect I wouldn't use it unless nobody was around or atleast I'd get permission to use it.
I hope all of that made sense.