Earthquake dampening structures built into a major elevated highway downtown (I 64 - US 40 for the locals). We don't have many earthquakes here but there is a risk of a big one from a fault near the Mississippi to the south. In 1812, one of the most powerful temblors in American history struck the region. It changed the course of the river and is said to have rung church bells in Philadelphia.
Just for the record, the towers in the center are light stands in the adjacent baseball stadium.