It's not good for efficiency because you still have to keep those rudimentary signals for non-digital users of the streets. Like, you know, humans. While ths mi

It's not good for efficiency because you still have to keep those rudimentary signals for non-digital users of the streets. Like, you know, humans. While ths might work on closed tracks, it also means that "all vehicles" will never be autonomous, and unless you ban vehicles from cities, you'll not get close to "vast majority" either, so you'll never reap the complete benefits of this efficiency.