"You may not have room in your garage (or budget) for a dirt bike
and a snowmobile
and a four-wheeler. But what if one vehicle could take the place of all three? That’s the idea behind the Hyanide, a wild concept vehicle created by German designers Oliver Keller and Tillman Schlootz for the 2006 Michelin Challenge Design. "
I couldn't find more pics of the one above, but I did find some other similar concepts.
http://popsci.eurekster-swicki.com/Hyanide/