As far as I know, the mechanics and physics of an aircraft carburetor are the same as those of an automobile carb. (If I'm wrong, there is no basis for this question.) Aircraft carbs are provided with a carb heat option, while no auto carb that I'm aware of ever came with one.
If carb icing only occurred at the significantly colder temperatures experienced at altitude, I'd understand that this is an aircraft-only issue (or, perhaps, one that might effect only land vehicles at very high latitudes or during extreme cold snaps). However, it is a well established fact that carb icing can occur in temps as high as 20-25°C (68-77°F) even in somewhat low relative humidity (as noted in this answer) - conditions in which automobiles are frequently (commonly, even) operated.
While I certainly appreciate that an engine out event is a significantly more critical issue in an aircraft (quick, where the heck do I land before I crash and die) than it is in a Earth-bound vehicle (signal, check mirrors, coast to a safe stop at the side of the road), why is carb icing even an issue in aircraft when it doesn't seem to be an issue at all in autos?
Note: I realize that few to no automobile engines are carbureted anymore, but that was the norm until nearly the turn of the 21st century.