SUBMITTED BY CDOT
Potholes are caused by the expansion and contraction of ground water under the pavement. When the water freezes, it fills more space under the pavement, which then expands, bends and cracks, weakening the road surface. When the ice melts, the pavement contracts, leaving gaps or voids underneath the surface. This continuous “freeze – thaw” cycle weakens the pavement and allows it to continue cracking. As the weight of vehicles pass over the weakened pavement, it causes it to break and creates a pothole.
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