Reader mfs asks a question I’ve always wondered about too: There’s a very large deck over I-66 in Arlington, which from satellite photos appears to be just a parking lot. Anyone know why this is here, and why anyone would spend the money to deck over a freeway just to put parking atop it?

David Alpert created Greater Greater Washington in 2008 and was its executive director until 2020. He formerly worked in tech and has lived in the Boston, San Francisco Bay, and New York metro areas in addition to Washington, DC. He lives with his wife and two children in Dupont Circle.