#4. Citroen GT – 2008
Citroen and Japanese racing simulation company, Polyphony Digital, joined forces in creating this concept car. When Citroen GT premiered in 2008, everyone expected to see its production commencing soon. However, 8 years have passed since and apart from being able to download it in Gran Turismo 5, people can’t enjoy driving it.
#3. Mazda Nagare – 2006
Inspired by nature, Mazda developed a concept car in 2006 and premiered it at the Los Angeles Auto Show. We assume its engine was hydrogen-fueled, although the Japanese company never confirmed it as they gave up on its production soon enough.