The goal of bridges is to span across rivers or valleys, streets or highways, rail yards or railroad tracks. Essentially a structurally supported deck, a bridge is a connector enabling movement between whatever the bridge connects. But a few bridges achieve another goal: If the bridging deck supports activities and structures, it is a destination as well as a connector.
With sufficient length and width, a bridge can become in effect built land, a place for residential, commercial and recreational development, a “reconstituted ground plane” in architectural parlance.
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