the Snow Chain mode provides maximum possible traction at speeds up to 25 mph

Anybody know exactly how it does that. Does it allow limited wheel slip? If so is it a percentage of front wheel rpm? Does it prevent one side from slipping if the other side is grabbing--maybe by applying brake to the slipping side?

In other words, just exactly what does it do and how does it know to do it?

Thanks.

J. M. van Swaay