Many years ago I got up one dark winter morning to go to work. We had had a freezing rain over night and the country road was covered with cold ice. I went about 200 feet and slid to the shoulder, so I parked it and went back to bed until it starter getting light. I went back to my van and put a tire chain only on the left rear drive wheel, because the right one was in some snow. I feared that I would have trouble because of a chain only on that one wheel, but driving very carefully I made it to work without a problem. Many others did not make to work that day.