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"Except in aquaplaning", is a huge caveat. When you are sliding on ice, snow, or slush, you are actually hydroplaning. You can slide very easily on rough ice, while maintaining perfectly good traction on very smooth dry glass. The difference here is a microscopic layer of water between the solid ice and the tire. The pressure caused by the weight of the vehicle will "squeeze" or "melt" this layer of water from the ice, so that it will nearly always be present in those conditions.
It is why an ice skate will glide over the ice instead of digging into it.
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