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- Wood is an excellent natural resource that can be used in small to medium bridges that can support; pedestrian or vehicles with weight limits.
- Wooden bridges seen nowadays are used to transport, people, cars, and livestock over rough terrain or small covered bridges that span small rivers.
Stone Bridges
- Stone is another excellent natural resource that can be used to construct large bridges as it is a very heavy and strong material that it can support large loads.
- The Point du Gard aqueduct in France uses stones that is 48.8m high and 275m long that has been stable for two thousand years.
Concrete and Steele Bridges
- Concrete and steel bridges are modern materials that are; durable, long-lasting, and versatile that are used in a majority of bridges around the world today.
- This material coupled with cables and other modern materials can create very strong bridges that are able to transport people, cars, and trains over very long distances.
