Where do potholes come from?

Potholes start in cold temperatures when groundwater freezes and expands. Once the ground thaws out, it returns to a normal level. But, pavement pushed up during the ground freeze remains raised. This causes a gap between the pavement and the ground. Vehicles riding over these gaps cause the road surface to crack and fall into that hollow space.

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1. Where do potholes come from?
2. How do I report a pothole?