Here in central UK we have had a decent fall of snow over the last few days. When I couldn't get my Box' off the drive this morning I used the poly rope trick to get traction. This is old trick but new to me so I thought I'd share it in case it helps others:
Take some 1/4" dia poly rope and wrap it through the wheel at each spoke position to form a simple snow chain. It lasts only long enough to get you on to a cleared road but does work.