We are a species of bridge builders. Since time out of mind, humans have engineered structures to vault over obstacles with the help of logs, stone, steel and, of course, ingenuity. So, what keeps our bridges steadfast and strong? See more »

If you were on the road for the holidays, you probably spent some time staring at the bumper in front of you. Can you imagine a world without gridlock? See more »

At first glance, it looks like a high-tech scooter. But people who have tried out the Segway claim that it is much, much more. Find out what's going on inside the Segway and what makes it so unique. See more »

London without the Tube? New York without its underground scene? Atlantans gliding straight from their MARTA stops to the airport? What would life be like without our underground transportation system? See more »

While traveling along the Interstate, you may have noticed that truck weigh stations occasionally dot the highway. What are these weigh stations for, and how do they measure the weight of a truck? Find out the answer in this article. See more »

Is there any rhyme or reason to how U.S. interstate highways are numbered? See more »

In the news about the recent accident at a ski resort in Austria, the reporters called the cable car that carried the skiers up the mountain a "funicular railway." What is that and how does it work? See more »

I've noticed that the insides of road and subway tunnels are usually covered in ceramic tile. Is there any particular reason for this or is it simply convention? See more »

Much of today's environmental conversation revolves around personal choices (perhaps an offshoot of An Inconvenient Truth.) Learn more about the 5 reasons why large dams have to go now; 5 ways to help make that happen. See more »