Birds already do most of the work to avoid collisions, and automated control of low-flying "cars" can work if there's a good system of coordination (ADS-B++) an

Birds already do most of the work to avoid collisions, and automated control of low-flying "cars" can work if there's a good system of coordination (ADS-B++) and "lanes". Yes, we can have lanes, which I imagine will exist in layers above freeways. Of course there will be times where weather shuts down the air traffic, but with computer control of the aircraft's navigation they could be usefully integrated into the national highways and airspaces.