Both Illflem and Rotty have good points. Siping will eliminate almost all need for the chains, especially in 4 wheel drive, but they won't cut it in severe heavy snow. And I remember the first time I put on my chains, I did it exactly as Rotty has warned not to. It was barely above zero, and the snow was coming down an inch an hour (pretty decent rate), but the real kicker was that it was coming down sideways. That hurt.