Transport networks reflect the political context, namely the capacity to trade. Economies with a high level of economic integration tend to have well-connected networks, while economies with a low level of economic integration tend to have poor connectivity. Before an economic integration process (such as a free trade agreement), networks are structured to service their respective national economies with flows representing this structure (limited crossborder flows). With economic integration, the structure of transportation networks is modified with new cross-border linkages. Flows can also be modified and see their reorientation. In some cases, there could be a relative decline of national flows and a comparative growth of cross-border flows.