Here's another one from the world of unlimited conceptual design: the Cadillac World Thorium Fuel concept. Otherwise known as the Cadillac WTF. Created by Loren Kulesus, everything about the WTF has been created to last 100 years without maintenance. That's the reason for the element number ninety, thorium: to act as a nuclear fuel powering batteries that would power the car.

Elsewhere, every major system is redundant in case of a failure. And the wheels don't have individual tires - in fact, what's located at each corner is one combined unit made up of six individual wheels. That gives you 24 wheels in total, and each wheel has its own induction motor. Said Kulesus, "The vehicle would require the tires to be adjusted every five years, but no material would need to be added or subtracted.