This one has just got the go ahead:
http://steamcommunity.com/sharedfiles/filedetails/?id=227184794
BeamNG drive.
I played the demo, was quite fun. Don’t expect jaw dropping graphics (although they are not sub standard either), it’s all about the simulation and physics, which it does brilliantly.
You can get the demo from here : http://www.beamng.com/techdemo (94.3mb)
main page: http://www.beamng.com/BeamNG.drive