This dimension groups transport infrastructure by what it was actually built from. Wikipedia notes that "most bridges consist of a flat deck, supported by beams, arches, or cables," and the material chosen shapes how long a structure lasts and what it can carry. Browsing by material lets a visitor compare structures built the same way even when they serve very different routes.
Facts
Comparison
Era of Emergence Material
Sources
1. Wikipedia: Royal Road
WikipediaRoyal Road, Achaemenid reconstruction, Roads Highways and Trade Routes subcategoryQuote, Royal Road, Achaemenid reconstruction, Roads Highways and Trade Routes subcategory
reorganized and rebuilt for trade in the 5th century BCE by the Achaemenid Empire
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