[HOT] Trunks in Highway Tag Africa

Fernando Trebien fernando.trebien at gmail.com
Wed Jan 27 15:23:01 UTC 2021

On Tue, Jan 26, 2021 at 12:39 PM Rafael Avila Coya <ravilacoya at gmail.com> wrote:
> National tagging conventions prevail, unless they are too far from the
> general highway=* tagging wiki.


In this type of situation, the national convention should probably be
revised to better match the more general guidelines.

An example: Madagascar seems to be following a classification similar
to mainland France, where trunks must be divided and have 2 lanes per
direction. As a result, there is no trunk road network there. Yet, the
two largest cities (Antananarivo and Toamasina) are linked by a paved
road in good condition. [1] It surely could be trunk if one applies
the same logic that promoted to trunk Iceland's Ring Road, [2] which
was partially unpaved until recently and is still mostly a single
carriageway with 2 lanes (1 per direction) without a shoulder. But
that main road in Madagascar cannot be trunk according to Highway Tag
Africa and the national guidelines. [3] Google and Waze display it
(and several others) using their types equivalent to trunk in OSM.

[1] https://en.wikipedia.org/wiki/List_of_roads_in_Madagascar
[2] https://wiki.openstreetmap.org/wiki/Is:Map_Features
[3] https://wiki.openstreetmap.org/wiki/FR:Madagascar_tagging_guidelines

Fernando Trebien

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