Tizen is the "OS of everything," bringing you a unique cross-device user experience. As you move from one device to another throughout your day, Tizen travels with you: It powers the phone in your pocket and the device on your wrist. Tizen is with you on your daily commute in the dashboard of your car, and it greets you at the end of the day when you turn on your smart TV.
Tizen's code isn't locked away behind closed doors, either. It's open-source so developers all over the world can contribute, helping make it the best OS it can be.
The Tizen In-Vehicle Infotainment (IVI) project is driving the smart vehicle revolution, providing a Free and Open Source Software (FOSS) operating system development platform for IVI embedded computing systems. The Tizen IVI solution enables modern portable applications to provide rich Internet and multimedia experiences to consumers while they travel by leveraging the Tizen code base for mobile computers and handsets, and extending its functionality into vehicles.
There is a lot more information available on the main Tizen IVI Developer page.