Terrafugia, Inc., the Woburn, Mass., company developing a flying car or "roadable aircraft" called the Transition, says it received special exemptions from the National Highway Traffic Safety Administration.

The exemptions, which are particular to vehicles that fly and drive on roads, will allow the company to begin delivering the Transition when it is ready late next year. They allow the Transition to use plastic windows instead of standard automotive safety glass, and tires that aren't normally allowed on multi-purpose vehicles.

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