One other note: staying in 4WD is such conditions will help a little bit to maintain lateral stability. 4WD is not a panacea that will fix all problems, and certainly will not make you stop any faster, but it can help some in preventing fishtailing with a rear wheel drive vehicle like that pickup did when he drifted over into the icy slop and lost control. But the best thing to do is slow down! This gives you more time to react to the fishtail skid event and to steer into the direction of the skid and regain control.. You will notice that the delivery truck driver did a pretty good job of regaining control of his vehicle even after he was set sideways by the pickup hitting him unexpectedly. You guys that live in colder climes might want to chime in here with your thoughts, but us southern boys slow down when things get bad.. those that don't... well the wrecker and ambulance guys will do their best..
James K0UA