Reminder :4x4 is useless on ice without studs or chains

Now that winter is here, can we drop a quick reminder to everyone driving around not to believe those "buy a 4x4 and cope with winter" adverts. Without studded tyres or chains, all four wheel drive will do is get you into trouble by hiding the problems on the uphill, only for them to surface on the descent. Here is some footage from Seattle last week:
Lots of these vehicles are 4WD, but once you've hit the brake pedal, that's useless. Winter tyres then studded tyres (legal in Washington State during winter) and chains are what you should be thinking of. Otherwise, stay at home. Don't walk down the sidewalks on roads like this either. If you have a 2WD car with traction control features, when that light starts flashing it means "chains on". No chains? Pull over, park on a road that isn't so steep, walk.