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Steel Bridges

Usually these types of bridges are 20m – 100m span Very similar to simple beam bridges, but the beams are replaced with trusses, making them much deeper and lighter. Easily widened with additional trusses, supportive columns etc fabricated either at site or at the yard.
More complex to build where there are less space on the high pressure rivers and streams.
Depth is typically 12% of the span, so the roadway has to be higher if the bridge is to have sufficient clearance over water, railways etc.