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How potholes form

Water penetrates asphalt and freezes to destroy roads

Last Updated: Jan. 14, 2014

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Canada's recent cold snaps have caused freezing water to buckle roads that were smooth only a few weeks ago.

The interactive below shows how rainwater gets under the surface of a road, heaves upward when the temperature drops, and leaves the asphalt shattered when the temperature rises once more.


Winter storm slams northeast U.S.