Read this tip to make your life smarter, better, faster and wiser. LifeTips is the place to go when you need to know about Pay Toilets and other Public Restrooms topics.
An additional, optional feature for pay toilets (as well as for other public toilets) is a window that says "in use" once the customer has deposited the coin or token, opened the door, and entered the pay toilet.
When the customer exits, the door re-latches, and the window display flips to "vacant." It is ready for the next customer to insert a coin or token. As long as the door closes completely, it won't open again until the next customer inserts a coin or token.