European toilet key
People with disabilities who travel a lot and are actively involved in social activities know very well the discomfort caused by not having an accessible toilet. It is equally disturbing when there are accessible toilets that are locked and nobody knows who has the key. Accessible restrooms are usually locked to prevent their use by people who do not need to use them. Actually, it is not known what the bigger problem is. An accessible toilet that is locked or an accessible toilet that is unlocked but soiled by those who can stand and are not forced to sit on the toilet seat.
The European member countries found a universal solution and it is called the European Toilet Key.
Read all about it at the link: https://disabledaccessibletravel.com/european-toilet-keys/