On Fri, 26 Apr 2024 at 03:16, Juan Pablo Tolosa Sanzana
<jptolosanz...@outlook.cl> wrote:
> There are no road network in King George Island, only a few short roads to 
> serving research stations.

What is the minimum number of roads needed for a set of ways to
qualify as a road network?

Consider Tuvalu, listed by Wikipedia as having one of the smallest
road networks in the world.[1] It has a population of around 6
thousand people. Its main island, Fongafale, has one main road that
passes by an airport and only a few other local roads (streets). In
OSM, the main road is mapped as highway=primary.

For comparison, Niue has around 1,700 inhabitants. Its capital town,
Alofi, has around 600 inhabitants, and its other main villages have
around 200 people or fewer each. Niue's main villages are linked by an
unnamed highway=secondary in OSM and the smaller ones are linked by
highway=tertiary. For example, the route from Alofi to Lakepa, a
village of 87 people, is highway=tertiary. Niue has fewer people and
more roads than Tuvalu. Which of these factors allows using
highway=tertiary or higher?

Other examples include Filicudi island in Italy, with 235 inhabitants,
where one unnamed highway=tertiary road connects its main villages,
with only a few local roads branching off from it, and Agathonisi
island in Greece, which has the same pattern.

[1] https://en.wikipedia.org/wiki/List_of_countries_by_road_network_size

-- 
Fernando Trebien

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