well, first auto-car, then auto-truck, then auto-truck-train. (3-10 trailers with one tractor, and possibly hub motors suitable for long hauls with no turns) Th

well, first auto-car, then auto-truck, then auto-truck-train. (3-10 trailers with one tractor, and possibly hub motors suitable for long hauls with no turns) Then electric cars pas gas based cars. Then electric trucks with droppable battery packs - full charged in 2 minutes by changing it. Then they will get into local driving and delivery, into large mechanical drop boxes at houses and businesses. Deliveries 24-7. The box can be a wall port with a live floor = lots of space. The beginning of the robot age. The last thing they will invent, before people are gone, will be the robot consumer...