The freezing and thawing we’ve experienced so far this winter along with ample snow and moisture has caused potholes to show up on Iowa’s roadways. Potholes are mostly caused by moisture getting into or underneath pavement. During freeze and thaw periods, moisture causes the asphalt or concrete roadways to shift, buckle, or break. When vehicles drive over these weakened areas, the patches can come loose, leaving those dreaded potholes…