Transport Access & Mobility Constraints

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Abstractions about how movement across space is enabled, restricted, or unequally distributed, including administrative and route-level controls such as internal border control and rat running, and structural determinants of access like maritime transport, threshold population and the transport divide.

5 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Internal Border Control — Condition movement across a subnational boundary on inspection, documentation, permission, restriction, or closure imposed within one sovereign state or integrated territory.
• Maritime transport — Move passengers or cargo through a waterborne transport chain that couples vessels, navigable routes, ports or terminals, schedules, custody interfaces, and maritime legal and safety regimes.
• Rat running — The use of residential or otherwise unintended minor routes as shortcuts around congestion on designated main roads.
• Threshold population — The minimum market population needed to support a particular good or service at a location under assumptions about demand, price, costs and travel behavior.
• Transport divide — Systematic inequality in the availability, affordability, accessibility, safety or legal usability of mobility options, producing unequal access to work, services, participation and migration.