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Either one's going to require superconductors, and I can only foresee two possible ways to get it done, without simply using thrusters directed downwards:Honestly, I'd prefer a hover car before a flying car with hover capabilities.
A massive underground system of tunnels, each of which are wide enough to accommodate the safe travel distance for several vehicles. Fill these in with a particular kind of metal. 'Tuned' magnets in the cars repel the underground metal-tunnels depending on the power pumped into it, and when they leave the effective field of the tunnels, they move on thruster power to get to their destination more precisely.
Alternatively, a similar thing, but it would work everywhere, where instead of repelling underground plates or tunnels, the magnetic field of the Earth itself is repelled.
An anti-gravity device would be better for getting the latter done, but so far there's been no scientific indication that anything like anti-gravity would be possible.