when a car is driving normally, the surface of the tire isn’t moving relative to the road. that’s what rolling is, and it allows the tire to grip the road tightly. when your begin to skid, the tire is now sliding across the road and can’t grip it. by pointing the tires in the direction of the skid (steering into it), you’re hoping the tires and the road will start moving in unison again, giving the tires their strong grip back and allowing proper steering.
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