Diagrams of tunnels and bridges give you an insight into the advancement of the technology. Generally, we all know that it is advancing more and more, but not always we are aware for its real expansion. Technology has come a great way since the old wooden or simple concrete bridges or tunnels. Nowadays, they are ultra modern, have all the necessary signalization and are far more bigger. Also, they are much safer and much durable than the older versions. 
Diagrams Of Tunnels and Bridges
See the illustrations on the pictures below. For more details you can click the link under the pictures.
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