GM Firebird IV Concept
The Firebird IV debuted at the 1964 New York World's Fair, in General Motors Futurama Exhibit. It was another sleek, aircraft-inspired, turbine-engined 'future' design, internally coded by GM as XP-790.
It was conceived for a future where cars were guided automatically via programmed guidance systems, to "insure absolute safety at more than twice the speed possible on expressways of the day". Though billed as being turbine-powered, the Firebird IV was in fact non-functional.
The Firebird IV was repackaged for the 1969 show circuit as the Buick Century Cruiser. Reportedly, the show car was crushed in the 1980s.
Source: Wikipedia, 2015