Well, as soon as we stop believing that gravity is caused by mass, we will see lots of flying cars.

Well, maybe not flying cars. Maybe they will be flying saucers.

The big problem for me is that many people cannot handle two dimensions when driving. How do we expect them to handle three? Of course, self flying car programming will be a lot easier. Lanes defined by computer. Pedestrians and bicycles no where nearby to get ran over.