maybe instead of adding even more complexity to solve the issues our solutions are creating, we could wait until we have solutions that don't create huge issues. What happens if the thing locks all the doors and manual controls and then drives off a bridge? Or if it's caught fire. Personally I'm barely okay with taking planes, if there was a car that could, at any moment, turn into a prison cell I'm not going near one of those things as long as I live. Even if they say they've disabled the "feature". Do we really trust these corporations with our lives so much that we're willing to get perma-locked into their test vehicles?
Kia and Hyundai have already made that trivial the past few years. At least with the tender to their provider and GPS the robot taxis should be recoverable and disableable.