After trying to drive on a snow and ice covered road with only winter tires I figured I'd have to leave the car in the garage until the end of the season. Before adding Auto Sock I was able to travel 5 meters on my 650 meter road before stopping. I have a rear wheel drive Mercedes E 350 and the traction control has disabled everything. After attaching Auto Sock to my rear wheels, I just kept climbing. I never slipped and felt the transmission upshift as the speed increased. I am very impressed with the ease of use and the benefits it has brought me.