This illustrates the need for winter tires....but those AS that the quattro are sporting will not stop or turn as well as the winter tires that the BMW owner is surely driving now...
http://www.tirerack.com/videos/index...=23&tab=winter
http://www.tirerack.com/videos/index...=26&tab=winter
AWD is great for going...but adds nothing for stopping or turning...my QX56 is sporting these for the winter...
http://www.tirerack.com/tires/BigPic...e1=yes&wTire=0