1. Crossing
1.1 Presentation
A bridge is an engineering structure that enables one or more communication routes to cross a relief feature known as a gap, or other communication routes (figure ).
Depending on the type of traffic — road, rail, footway or canal — the bridge will be called a road bridge, rail bridge, footbridge or canal bridge. These structures may have similar external shapes, but are differentiated and characterized above all by the particular nature of the traffic they have to carry.
The general architectural design of a crossing structure uses the three basic modes of mechanical operation...
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Crossing
Deck support systems
