While most people get on the road each morning around the U.S. to drive to work, they may not think of how the massive interstate system first emerged in the years following World War II. That rather interesting question, along with a number of other transportation themes, is covered in this fine online collection from the Smithsonian Institution. Designed to complement this new exhibit at the National Museum of American History in Washington, D.C., visitors can start at the exhibition section, which is divided into 17 different thematic sections, coupled with a host of visual images, and photographs of the actual exhibit. Even more fun is the collections area, where users of the site can search or browse through the online transportation collection which includes more than a thousand different artifacts and photographs. The site is rounded out by a nice selection of related teaching resource materials and some quirky interactive games where individuals can create their own movie using vehicles from the collection or play a match game involving vehicles from different periods of America's history.