[JoeAltmaier]

The air is a whole lot bigger than the ground. Roads are 33 ft wide. The air is - the air! Its miles wide and 3D. It would conceivably be had to collide with another air car if you tried.

Takeoff and landing is the risky time, and that is mitigated by the timing - it takes seconds to land this thing (100 yd airstrip) so you'd have to attempt to land at the same moment as someone else which is in your favor.

[chrislomax]

I agree but at the same time you would have hot spots. Shopping centres etc etc. This car is also not automated so how would you avoid mid air collisions? You would obviously need to land near your street, so there would need to be designated landing strips, you couldn't just plonk down in a field somewhere.

It would be like frequencies too, you would only be able to fly in a limited amount of "space". The rest would be reserved for airplanes and helicopters.

It's only the same as airplanes having to follow flight paths, there would be directions that car-o-planes could go in.

I know what you are saying but imagine London or New York with flying cars everywhere. The end result would really be no different. Concentrated areas with millions of cars flying in it.

Although... http://www.firebox.com/product/415/Moller-Skycar-M400