Self-driving taxis are a fantasy
medium.com
medium.com
(The query says "subway restroom")
It's a classic failure of imagination. When you live your entire life using (or refusing to use) abysmally dirty public transit system, you kinda assume that it's a part of inevitable human nature. And then of course it stays unchanged, because everybody in the town knows it can't be helped so why waste precious budget on it?
Also it's easy to put a webcam inside an SDT to monitor what's going on - it's not a problem with a human-driven taxi that he could see you, so it shouldn't be seen as a violation of privacy. If you do something nasty a machine vision system can detect it, lock the car down, and drive you to that aforementioned police station.
Wouldn't people rather be in their own semi self-driving car, where they are not recorded and can go anywhere they want(including very long distances or bumpy terrains), plus they could take control of the car anytime they wanted? That would be a more reasonable option for many, not a taxi that you have no control over and where you're recorded like a rat in a laboratory.
2008, "All licensed cabs in Windsor will have on-board cameras by the end of August" - http://www.canada.com/windsorstar/news/story.html?id=1ea2956...
2000, for NYC "The in-vehicle security camera system takes digital photo images of the entire passenger area of the vehicle, and consists of a small camera with integrated infrared lighting that is installed above the vehicle’s rear-view mirror." - http://www.taxi-library.org/tlc-cameras.htm
2015 Uber driver with dash cam - http://www.latimes.com/local/lanow/la-me-ln-uber-rider-arres...
But if run by private enterprise they will either figure out how to deal with the problem or go out of business.
Capitalism isn't in vogue now but it is a tremendous self regulating mechanism that government will always lack. If you question that imagine how long a fast food restaurant could survive with bathrooms like the one in your picture?
In any case, the relevant comparison is a car-share club.