Just imaging, every car has a landing platform on the roof. A centralized traffic system knows the destination of each car. Drones can just jump cars, and if there is no car going in the right direction, lift off and finish the rest of route themselves.
The first stepping stone is probably drones based on UPS and FedEx trucks helping by making small package deliveries while the driver is dropping off packages in each neighborhood.
One could imagine you could sign up just by opting in on your navigation app.
However, I think practically speaking, I don't want the roof of my car damaged, so there would have to be some capital cost to create some kind of roof protector landing pad thing. So that might limit adoption.
On the other hand, if I drove a pickup truck, I wouldn't care. I would opt in without any changes to my vehicle. I would just need to make sure the bed is empty.
