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 simplicity of the U.S. highway system is something that can be taken for granted, but when you stand back and look “it ...

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 ...