Many indoor parking areas use lights so you can see if a spot is vacant or taken way before you get there. A company called Tooshlights figured it could install the same system in public restrooms. Its eponymous product works exactly the same as parking lights: they will shine red LEDs when a stall is occupied and green if a stall is vacant.
Here’s an animated video about Tooshlights:
Tooshlights is also working on a mobile app that will be tailored to a specific area. Say you’re in a stadium and you want to go to the restroom. You can then use the Tooshlights app not just to find the nearest restroom, but to check exactly how many stalls are available in that restroom. Tooshlights will make a version of the app for management that reveals more information about the condition of their restrooms.
They should have a brown light as well. You know why. Wipe your hands properly and head to Tooshlights’ website for more on their product.