I'm actually currently working on projects related to traffic management systems for UAS. I'd say that currently air travel is much more complicated than street

I'm actually currently working on projects related to traffic management systems for UAS. I'd say that currently air travel is much more complicated than street travel. And there is a lot of research and engineering that needs to be done before we can safely handle large amounts of UAS traffic. For one, UAS take up more space than cars. Sure they can be smaller, but operators/systems need more space to safely fly. Two, we don't have systems in place to handle large amounts of traffic. Traffic on roads is much simpler. You have well defined routes, and you have well-defined regulations to safely handle adverse driving situations. UAS do not currently have systems that can automatically handle large amounts of traffic or adverse flying conditions. Plus the autonomous systems are currently not quite up to a human pilot's ability to fly. There may be some very advanced autonomous flight systems, but there isn't anything that could handle the amount of traffic comparable to current street traffic. I think this is definitely an exciting time for autonomous flight. But I also think we are just really starting to get around to solving the problems caused by UAS. I don't know if it's fair to compare large amounts of UAS traffic to street traffic. I think the state of UAS traffic management is closer to the state of street traffic 100 or so years ago. UAS safety systems and airspace regulations definitely aren't sophisticated.