When I was in Paris, circa 2000, I came across some interesting pay toilets that were kind of like the Cadillacs of porto-potties. They were located on streets in nice shopping areas. You'd pay for the door to open. They had running water, but no water or fluid in the toilet bowl. Instead, the toilet was more like a concave shelf for peeing and/or pooping on.

When you were done, you'd leave through the door, which would lock behind you, and then for a minute or two, it would go through a self-cleaning cycle, making itself (putatively) spotless for the next customer.

They even had the same idea scaled up to entire motels. Near Lyon, I needed to catch 3 hours of zzz's before going to the airport. I found a motel called "Formule 1". It was a seemingly automated motel. You hardly ever saw an employee.

To park your car, you slid your credit card through a card reader at the parking lot gate, and it charged you $20 or so. You would be given a receipt with a combination number for the front door and for your room.

The bathrooms were down the hall from your room. They were somewhat similar to the fancy porto-poties. Though they also had showers in them. The shower was on a timer. When you left the bathroom, the door would lock behind you for a while, as it would go through its cleaning cycle.

France is strange!