Working on Dark Surrounds has given me some time to think about where this might go. Initially this was just a practice run for the 2012 Global Game Jam, but having developed more advanced techniques over the last year, I now have a few ideas on how this might become more than just a demo. I'm fairly happy with the feel of driving in the game – I placed much more of an emphasis on fun than on realism – but the environment is pretty boring. Perhaps that's to be expected given it just uses Unity's inbuilt terrain engine (and the inbuilt textures), but using the tools I've developed for Dark Surrounds, I can come up with something much more interesting.
I likely won't actively develop this for at least the next few months while I continue working on Dark Surrounds, but I'll be further developing my toolset with this in mind which should hopefully mean I can progress fairly quickly once I have some time to devote to this.
If you've played the demo above, hit me up with a comment and let me know what you think about the driving mechanics; it's very early stages for this game, so it'd be good to get some feedback before I go too much further.