If your drone fails catastrophically such that it no longer has enough working propellers to land safely, then you crash and die. Simple as that. The same can h

If your drone fails catastrophically such that it no longer has enough working propellers to land safely, then you crash and die. Simple as that. The same can happen in a vehicle, or any other aircraft. In the end, the loss of life amounts to somewhat of a handful of people. No worse than car accidents which kill people daily and all the time. Recommended height? It's already laid out, just look at aeronautical maps. The technology will come. What we require is more battery density and perhaps better materials. Prototype drones for human transport are already out there. It is certainly a lot less edge cases. But again, when it comes to aircraft people seem to exaggerate dangers and make it seem like a big deal. Aircraft are safer than cars when you know what you're doing. Because humans also don't currently fly drones to get around, you don't have to deal with all the human cultural and behavioral quirks that come with traffic. Good luck with your self-driving car on India's streets. I have come to believe that by the time self-driving tech is truly viable at level 5 autonomy, personal drone transports would have long been viable before that.