What is a Viaduct?

A viaduct is a bridge composed of a series of spans, or arches, that are supported by piers or abutments. It is typically used to carry a road, railroad, or canal over a valley or other obstacle. The term "viaduct" is derived from the Latin words "via," meaning "way," and "duct," meaning "leading."

Viaducts can be made of a variety of materials, including stone, brick, concrete, and steel. They can range in size from small, single-span bridges to large, multi-span structures that stretch for miles. Some famous examples of viaducts include the Forth Bridge in Scotland, the Golden Gate Bridge in San Francisco, and the Brooklyn Bridge in New York City.

One of the key advantages of a viaduct is that it allows for the construction of a bridge without the need for a large, deep foundation. This makes it a cost-effective option for crossing wide valleys or other obstacles where a deep foundation would be impractical or too expensive. Additionally, viaducts can be designed to allow for the passage of heavy loads, such as trains or highways, making them an important infrastructure component in many parts of the world.