It's a concept that has been tried more than once...
a car that flies, or an airplane that can be driven on the road after landing.
Those concepts failed because airplanes make lousy cars and what we accept as a minimally satisfactory automobile has proven much too heavy to fly.
But there has been a huge change in materials used to manufacture cars over the last 20 years... construction is lighter, and therefore more like aircraft.
Have we finally reached the point where a flying car is feasible?
Take a look and see... whatd'ya think?
That video is embedded in an article with more information here, and if you're still interested, there's more on the subject in an article here.
Problems I can see from the outset:
-Engine mounts, wing roots, empennage and other airframe bits will have to be inspected annually or as FAA certification requires, normally on a flight-hour or calendar basis. Driving this car/aircraft will expose it to vibration and stresses a normal aircraft won't experience. The certification and inspection process will have to take that into account.
-It will have to be insured as a car AND as an airplane. Insuring it as a car may be no big deal, but insuring any new aircraft is iffy, and insuring one this revolutionary may be problematic.
But if this thing works... if the problems can be worked out... I'll be in line to buy one after a couple of them have accrued 5,000 hours or so flight time!
(Watching closely and keeping my fingers crossed.)