https://www.cnet.com/roadshow/news/goodyear-golden-sahara-tires-geneva-motor-show/

Goodyear's chief involvement with the car -- both then and now -- is a set of translucent tires made of synthetic rubber. Dubbed Neothane, the material allows for internal lighting. At the time, the company was investigating whether tires could be illuminated when a vehicle was under braking or in bad weather for improved visibility. Another novel wheel-based feature? Crystal hubcaps that feature built-in turn signals. 

The Golden Sahara II was put on tour nationwide as a vision of the future, including numerous appearances on TV and in film. It was then left to sit in a garage for nearly 50 years. The car was subsequently purchased at a Mecum Auctions event in May of last year by Klairmont Kollections -- for $350,000.