So a venue is opening up (not mine I have been asked for advise)
There are 3 toilets in a corridor with no room to socially distance and an external door
How do people outside the door know if the toilets are empty and they can go in or busy and they need to wait outside to enter
Everything I have come up with requires touching (blackboard and chalk, numbered tag, sliding in/out labels)
Anyone come up with anything clever?