Grady Hillhouse of Practical Engineering explained the general style and design of every type of bridge over the course of 15 minutes. He looks at the different types of trestle bridges ...

We see different examples of the materials used to make bridges, including stone, cast iron, brick and steel. Using plastic is a good idea; it is light, easy to build from, doesn’t need cranes ...

Over the last year, the NTSB identified 68 bridges built before 1991 that don't have a "current vulnerability assessment." The recommendations were issued to 30 owners of the 68 different bridges ...