After reading through this thread, I'm surprised that nobody has mentioned "Winter Tyres" or "Snow Chains"! They really make an amazing difference when driving on ice and snow and work really well with any two wheel drive vehicle as I have. In Sweden, it's illegal to drive without snowchains in winter (correct me please if I'm wrong). I will admit that they can be expensive between 100 and 150 pounds for a set, but you wont get stuck easily and make driving in ice and snow a lot safer than with normal tyres, meaning less carnage on the roads. OK, we don't see this kind of weather too often and chains might sit in your garage or shed for a couple of years without being used. If every road user had chains or at least changed to winter tyres, less grit would be needed for the roads and folk shouldn't then be stuck at home and unable to travel because grit supplies are running low!