Winter weather is one of the main causes of the dreaded pothole. That's because roads are more than just the asphalt on the surface. That is just the top layer, underneath is a thick layer of rocks and soil. Sometimes when it rains that water can seep below the asphalt.
When freezing temperatures hit the water under the road's surface expands, shifting stuff around. When it melts the pressure from something like a car can cave in the payment creating a pothole.
It gets really bad when you get into a cycle of freezing and thawing. The afternoon sun can melt the water while colder temperatures at night freeze it again. It creates a cycle where the sub-surface of the road is constantly shifting and can create some pretty massive potholes.
And while salt can help keep ice and snow off roads it can also make the pothole problem worse. That's because it lowers the freezing temperature of water; which means you can sometimes increase the frequency of the freezing and thawing cycle when extreme cold hits.
All of this can lead to a pretty bumpy ride by the time spring arrives.
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