[Marsh.]

Originally Posted by Jack_

I know what they're for, I just mean I don't think they ever put them above the toilets cause well, there isn't much point. How often do they lock the toilets? Now that would be a cruel punishment

As I say, they're above every single door. All doors can be locked by BB so will need indicator lights like those.

As I say it also allows them to see where doors are in the dark. Such as the toilet at night.