This is a terrible idea. Traffic in one dimension is bad enough. In three? It will make traffic congestion worse in every way. Cannot hear it until it is 200

This is a terrible idea. Traffic in one dimension is bad enough. In three? It will make traffic congestion worse in every way. Cannot hear it until it is 200 ft away. And if there are a dozen in a 200 ft radius, deafening. Rich people flying over poor people making their lives even worse. What horrible selfish technology I hope this fails horribly.