The story of America’s interstates is usually told as a straightforward tale of postwar progress, but the real origins are stranger and more contested than the green signs suggest. The Dwight D.

When you’re driving down the highway, you naturally pay attention to traffic signs. But do you ever think about why they look the way they do or why they’re a certain color? Take the green ones. Green ...

At first glance, the U.S. Interstate Highway system might seem like a logical grid-based masterpiece with a semblance of order behind its numbering system. Odd-numbered interstates run from north to ...

As the United States marks its 250th anniversary, WTOP presents “250 Years of America,” a multipart series examining the innovations, breakthroughs and pivotal moments that have shaped the nation ...

The Federal-Aid Highway Act of 1956, signed by President Dwight D. Eisenhower on June 29 of that year, funded the Interstate Highway System. Joining this transcontinental system, the Interregional ...