So you've built yourself a flying-car prototype. Where do you go next? Why, a heli-sedan, of course.

Terrafugia, a company focused on building practical flying cars, has begun feasibility studies of a four-seat, vertical takeoff and landing plug-in hybrid-electric flying car, the TF-X. Terrafugia said the vehicle will use state-of-the-art systems to "increase the safety, simplicity, and convenience of personal aviation."

Click through the slideshow to see more of Terrafugia's concept for a VTOL vehicle.

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Here's how Terrafugia envisions its vertical-lift TF-X concept.
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Terrafugia's vision of personal transportation has commuters flying over farmlands.
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Here's a look at Terrafugia vertical-lift TF-X concept with propellers folded down.
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Terrafugia wants the TF-X to be a plug-in hybrid-electric vehicle.
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Here's a look at Terrafugia vertical-lift TF-X concept with the wings folded.
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Here's what Terrafugia thinks its TF-X concept will look like sitting in your driveway.
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Another look at the Terrafugia vertical-lift TF-X concept with propellers folded down.
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Here's how Terrafugia envisions its vertical-lift TF-X concept on the streets.
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Another view of how the TF-X would look in flight.
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Here's what Terrafugia thinks the TF-X would look like driving along the coast.
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