What causes a pothole?

Potholes occur when snow and ice melt during Michigan’s seasonal freeze-thaw cycle.  The resulting water seeps beneath the pavement through cracks caused by the wear and tear of traffic.  As the temperatures cool to freezing overnight, the water becomes ice and expands below the pavement, forcing the pavement to rise.  As the weight of traffic continues to pound on this raised section – and the temperatures once again rise above freezing – a shallow divot occurs under the surface and the pavement breaks, forming a pothole.Pothole Forming

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1. How should I report a pothole?
2. What causes a pothole?
3. How do crews fix potholes?
4. What precautions can I take?