[dhughes]

To me a flying car is something which you could just decide to go up when driving along on the freeway not spend half an hour assembling it before you could fly.

I've always thought a lifting-body blimp/dirigible vehicle such as the size of a minivan would do well, the majority of the space inside would be filled with helium. Carbon fibre for the skin and other very light-weight materials would be used.

It would be low speed and easy to control since it would fly fairly slow but probably highway speeds.

The biggest problem would be crash protection that would require a lot of extra material such as bumpers, safety glass, strong seat backs.

[evilduck]

The biggest problem would be

a massive source of helium.

[dhughes]

Plan B is a vacuum in a lightweight super strong carbon fibre shell.