I am working on iPhone racing car game development using cocos3d.In this how can I get detection of boundaries of road in road-map.I have done with load pod file for road-map.I also want to know about how can I implement physics for car accident.Is their any sample code of game from which I get some information or tutorial which I can follow?
If I were you, I use Unity. Check out their Car Tutorial that's what you need.
Good luck