The Defense Advanced Research Projects Agency (DARPA) has come up with a Reconfigurable Wheel Track (RWT).
The tires can switch shape from round tires for flat terrain to triangular tracks for soft or rugged terrain in just 2-seconds!
You can see in the screenshot the rear wheels in tire formation and the front wheels changed to tracks.
The agility of this technology makes for better maneuverability and survivability for our troops and their transports and combat vehicles.
I wonder if someday soon, they will commercialize this technology so rather than all season/year tires or snow tires on our cars, we have these gorgeous ruggedized military grade babies.
I for one would gladly pay extra! ;-)
(Source Screenshot: Andy Blumenthal from here)