R
Ramana Gove

If we look at the way science and technology have been evolving, and make some logical extrapolations,these indeed would see the light of the day,probably in a much shorter span than we can think of.Undoubtedly, the cost effective ness, the redesigning of the roads to suit and sync with the algorithms that go into the making of the autonomous cars,(without which it would be a catastrophic substitution) and the needed ecosystems such as an enlightened awareness from co-commuters , pedestrians and the general public, are concerns to be addressed to.But the greatest feature of humans is, adaptability, and as such, they get adapted to the technology.More than autonomous cars, the flying cars may be reality much earlier, in view of: ever increasing need for momentum in mobility,an increasing population and hence road congestions. But as is pointed out, the greater thrust may demand fossil fuel technology unless some thing like hydrogen fuel cell technology( assuming that hydrogen is created with renewable energy but not by conventional electricity which again brings in climate issues) gears up to rescue.Then the main concerns would be monitoring air traffic, designing collision -free corridors , the concerns of debris.But as is the case with satellite orbital slots, there would be intra and interstate understandings to come in to play to stage the scene.All said and done, the concepts of fully autonomous and flying cars are sci-fi concepts at least for now