The treacherous winter weather is creating dangerous driving conditions around the country. In Dallas this month, a tractor-trailer drove up an icy hill and started to slide back down out of control, hitting a light pole. Also in Texas, cars careened into each other on an icy overpass in Houston this week. The Coast Guard had to break up thick sheets of ice on the Connecticut River Tuesday after they formed over the weekend. They were about four to five feet in diameter.