Stirfry192 writes with news that Terrafugia, makers of a vehicle alternately called a 'flying car' or 'roadable aircraft,' have been granted a three-year exemption to federal motor vehicle safety rules in order to foster further development and innovation. "The DOT granted the three-year 'hardship' exemption because it bought the argument from Terrafugia that its attempt to comply with DOT regulations at the same time as Federal Aviation Administration rules would be prohibitively expensive. Terrafugia had argued that an exemption would allow it more time to research more appropriate solutions to the requirements at the same time as making the flying car a feasible project. The company, an MIT spin-off located in Woburn, Mass. intends to use motor-cycle tires and rims instead of tires usually used for regular cars. The purpose is to minimize the weight of the craft."