> People haven't even been able field autonomous cars in silicon valley. The problem of unmanned ‎maneuvers is a lot simpler in a 3D space without any obstacle

> People haven't even been able field autonomous cars in silicon valley. The problem of unmanned ‎maneuvers is a lot simpler in a 3D space without any obstacles than on a road with many more uncertainties and information to process. See SpaceX achievement.