Needs ROOT.
This app allows you to enter and quit the Car Dock mode, so that you can assign it to an NFC sticker. Unlike some other apps that don't require root, this one not only launches a Car Home, but also does some other tasks, depending on the device: for example, on Galaxy S3 it enables loudspeaker and landscape orientation in TouchWiz.
Application is barely tested, and the first launch may be very slow because of a SU request lag. Please give some feedback.