The Holden Efijy is a concept car that will never hit the roads.

It was unveiled at the 2005 Sydney Motor Show and has made appearances at other shows including, this year's North American International Auto Show in Detroit.

With its beautiful curvy exterior and classic lines, it's always a show stopper.

The Efijy is the brainchild of Holden designer Richard Ferlazzo.

Ferlazzo made his first sketches in the late 1990s, and began work on the concept car in 2003.