Funny how, if we had weight and trip class segregated traffic infrastructure, walkable cities, car-free areas, etc. Then we would probably already have several successful self-driving taxi companies. As indeed, a point A to point B exclusive use highway would definitely be cheaper for mid and low density traffic areas than trains. But since everyone insists travel to be from front door to front door, then the transport network is just too complex and dangerous for the machines to deal with.