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STREETS & PATTERNS National or regional
City or town
District Local area Access to site or plot
3.20 • A hierarchy of roads and areas. Road types are closely associated with the spatial scale of the area they serve.
3.22 • Buchanan’s Venice. The canals form a three-tier ‘hierarchy of distributors’ based on arteriality, carving Venice up into successively smaller subdivisions. The routes suggested as ‘principal pedestrian ways’ all form a contiguous network, implying that the designation of this principal network is determined by arteriality rather than form (e.g. width) or use (e.g. pedestrian intensity).
3.21 • The ‘arterial’ pattern of a leaf. We can recognise that the pattern of veins on a leaf possesses arteriality although we may know nothing of the ‘flows’ along them. The assignation of links to the strategic road network is similarly abstract.
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