Vacant
We already talked about the scenario in which you are in a public place and you really need to rush to use the restroom. But this time, imagine you open the doors, walk into the restroom, and now need to search for a vacant stall. This could take up precious time you need.
Well, in some places, there are actually digital maps like the one here that is on display, to show you which stalls are free and which are not. This will save you some crucial time to make it to the toilet before you have an accident. Restrooms in this country are a dream come true.