The implementation of networks is rarely premeditated, but the consequence of continuous improvements as opportunities arise, investments are made, and conditions change. The territorial structure of any region is expressed as a network that includes all its economic interactions, but more realistically as sub-networks expressing one dimension. Transportation networks are the outcome of a trade-off between the goal to connect as many locations as possible and cost and infrastructure development constraints. A route is a single link between two nodes that are part of a larger network that can refer to tangible routes such as roads and rails, or less tangible routes such as air and sea corridors. The term network refers to the framework of routes within a system of locations, identified as nodes. Transport networks belong to the wider category of spatial networks because their design and evolution are physically constrained instead of non-spatial networks such as social interactions, corporate organization, and biological systems, which are usually constrained by other factors and where space plays a lesser role. Transportation systems are commonly represented using networks as an analogy for their structure and flows. Transportation networks are a framework of routes linking locations. The structure of any region corresponds to networks of economic and social interactions.
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