I'd be willing to bet we see self driving "moped/scooter" deliveries before self driving car deliveries simply because of the physics / liability implications. If reliable car systems can be developed, scaling down makes a lot of sense. Economically, it would be much easier to insure a moped than a car/truck, IMO.
How does the delivery get from the moped on the street to my front door on the 5th floor? Maybe a Segway type thing would work better, it just needs to be able to press the lift buttons.
