I'm doing some research on different sites that use Mambo/Joomla, and found this one. From the site:
It is the goal of the OScar Project to develop a car according to Open Source principles. In our opinion, a car is not a vehicle full of high-tech gadgets. Instead, we are looking for a simple and functional concept to spread mobility. Form follows function.
Apart from that, OScar is not just a car. It is about new ways of mobility and the spreading of the Open Source idea in the real (physical) world. On this website, you will find a great community of developers and drivers who want to invent mobility anew and together.
The project started in 1999. In December 2005, it reached release 0.2. Starting in 2006, everyone is welcome to participate.