Much of the world has a primitive version of this but unionized bus drivers prevent this from being economical in the west. It’s absolute comedy that NYC has a full fleet of 40 foot buses operating on its narrow streets, obstructing traffic, and forcing drivers to reverse to make turns. I hope they go the way of the buggy whip maker when autonomy is good enough for NYC, they’ve been holding us back from having so many nice things including smaller and more frequent buses.