We've had "Johnny cabs" for decades now in science fiction. People are clear on the concept. Once they work cleanly, smoothly, safely, I predict really driverl

We've had "Johnny cabs" for decades now in science fiction. People are clear on the concept. Once they work cleanly, smoothly, safely, I predict really driverless cabs will become the norm in half a decade. They need to look, feel, and be safe is all. Cabs don't have to handle all terrain; they can be constrained to known, plotted streets.