Actually, I just read recently that in Switzerland, were they are having an unusually harsh winter, that they are running out of salt and in some places they are resorting to using sugar, apparently its not as harsh on the environment or vehicles as salt and is still effective at lower temperatures, where road salt looses its effectiveness below a certain temperature (sorry don't recall what it is), sounds interesting, maybe the Swiss are onto something for winter driving.
Maybe when the snow and ice melts it makes the road sticky and you get better traction, yeah right