Why limit it to tracking? Why do we put these powerful machines in the hands of users that we know with certainty will kill themselves and others at a predictable rate and then just ask them nicely not to do harm?

The technology required to geofence, speed-regulate, and otherwise control where, when, and how fast cars can go already exists. Why aren't we using it? We don't need fully autonomous cars. There are all kinds of things we can do incrementally. I have to imagine some jurisdictions are going to realize this, eventually. And once they do the totally predictable savings to life and property will be unignorable.