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Globalization as an economic activity has been made possible by the development of global transport networks. Essentially these are multimodal and may include links by air or water or rail, but they will almost always include links by road. The ultimate destinations and points of departure of transport are on land. The addresses to which freight is consigned and where travel ends are places on roads. Roads are the basic infrastructure without which other modes of transport could not function in a systematic way. The terms road and route can be used synonymously, but the term road refers to physical structures, while the term route refers to knowledge of the way from one place to another, ways that can be waterways, airways, and railways as well as roadways. Roads provide a permanent way between places. In so doing they have over time evolved into multilevel network structures that range from the global to the local level of rooms in buildings and that profoundly modify environments and the human activities in them. Routes are an abstract concept of the way from one place to another that encompasses distance and direction, the physical factors of the biosphere traversed, the social and political nature of the polities to be passed through, and the existence and costs of support services. As the physical infrastructures of the different transport modes have developed, it has become possible to think of long-distance transport in terms of alternative routes and modes. This has facilitated an economic model of transport based on multimodal supply chains, which in conjunction with cheap oil, have brought about a massive expansion of world trade and transport. This is now implicated in the problem of climate change, which calls into question the paradigm of transport that has existed for some 6,000 years.

Evolution of Roads

Humans have evolved as bipedal animals that can walk and talk, have two arms available for carrying things, and use two eyes and ears for determining the best route to take. This remains their primary means of locomotion and is the rationale behind the evolution of roads. Since it takes less energy to follow than to break fresh tracks, humans tend to channel their movements. Frequency of use turns tracks into defined paths that in time become features of a landscape. However, bad weather and heavy traffic can make paths difficult to use, especially if people are heavily laden, have animals, or use wheeled vehicles. It is when people improve a path by laying a hardened, weather-resistant surface for long-term future use that it becomes a road.

The first global transport systems could be seen as the routes taken by our hominid ancestors in migrations out of Africa that began some million years ago. They would have carried children and the means of survival, but they were not road builders; they were route takers. Mitochondrial DNA analysis has identified the braided networks of routes Paleolithic people took from Africa into Europe and Asia by land and sea. They closely resemble the ancient Amber Road and Great Silk Road that go back thousands of years and point to the Fertile Crescent that extends from the Nile Valley through the Levant to Mesopotamia as the hub of this ancient network.

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