Funny that two of them are four wheel drives too. No excuse.

A 4x4 is no use in snow if it has no winter tyres.

Lots of them go off round here.. drivers think they are invincible but the laws of physics as applied to the summer rubber they usually wear are the same for all vehicles...

I also learnt that there are times when switching off the Traction Control on my Subaru was a far better way to climb up a snowy hill than leaving it on.

On our 1 series the DSC has 3 settings, default is full DSC which in snow when you need a little wheelspin sometimes to keep moving is useless. The second is the "driving god" position where TC and ESP are off and its up to you, never felt the need to try it. The third is what BMW refer to in the manual as the posiion that helps get you moving in snow, a short tap on the DSC button enables it. And it actually does work but I have only used it as an aid to get moving, once on my way I return to the default position.