^Flying cars are a very bad idea unless they're computer-controlled. People have enough traffic accidents in two dimensions. And if a normal car breaks down, you can just pull over to the side of the road, rather than falling to a grisly death.
A car that can alternate between flying and running on the road would be the best compromise I think. If it's having trouble in the air you just switch back to wheels! <G> Okay, so that's J.D. Robb's solution, but I just had to mention it.
I don't like bullies, I don't like threats, and I don't like you! - Janeway, "State of Flux"