Praised as one of the greatest public works project in American history, the Interstate Highway System is about to turn 70. Love them or hate them. The interstate highways are the arteries of our ...

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.

Ever wondered how the highway and interstate numbers came to be? What do they even mean if they mean anything at all? Behind those numbered shields displayed on the signs is a mathematical logic grid ...