[HOT] Trunks in Highway Tag Africa

Rafael Avila Coya ravilacoya at gmail.com
Mon Jan 25 14:21:37 UTC 2021

Hi, Fernando:

Indeed, the highway=trunk tagging should be well defined in general, and 
not only to Northern countries. And to keep the surface, smoothness and 
width out of that definition as much as possible.

One example of confusion among users is this issue in Central African 
Republic these days: [1]

One user changed some of the routes nationales of Centrafrique from 
primary (that was the convention) to trunk, because s/he thinks that 
this is the most correct as those axis are paved and have more traffic. 
S/he changed specifically the axis Garoua-Boulaye <-> Bangui.

Moreover, if you check the English Highway Tag Africa wiki [2], it makes 
references to the type of vehicles and orientative indications of the 
width, whereas (at least) the French [3], the Spanish [4] and German 
equivalents don't make such references, something I find more correct imho.



[1] https://www.openstreetmap.org/changeset/97503891
[2] EN Highway Tag Africa: 
[3] FR Highway Tag Africa: 
[4] ES Highway Tag Africa: 

O 25/01/21 ás 14:55, Fernando Trebien escribiu:
> Hi!
> The current definition of highway=trunk for Africa [1] and East Africa
> [2] appears to reflect mapping practices in some highly developed
> countries that are not common in most developing countries. The two
> points that I find very restrictive:
> 1. Restricted to motorised vehicles: not mandatory even in many
> developed countries [3]
> 2. Motorway-like layout with multiple lanes: does this include single
> carriageways with 2 lanes, 1 lane per direction?
> In the English wiki, the definition of highway=trunk is less
> restrictive, and so are many of its translations. In addition, many
> highways mapped as highway=trunk in Africa (and East Africa) do not
> meet these requirements and apparently did not at the time [4] of the
> edit.
> Sometimes trunk roads may not even be paved. Examples include the
> A-360 [5] and P-504 [6] routes in the Russian Far East and the
> Trans-Amazonian Highway (BR-230) [7] in the North Region of Brazil.
> Iceland's Ring Road [8] was also unpaved until recently in some parts.
> So, I would like to propose changing the definition in [1] to
> something like what the English wiki says: "The most important roads
> in a country's system that are not motorways." Possibly adding that
> these are generally the main routes between very large cities. What do
> you think?
> [1] https://wiki.openstreetmap.org/wiki/Highway_Tag_Africa
> [2] https://wiki.openstreetmap.org/wiki/East_Africa_Tagging_Guidelines
> [3] https://wiki.openstreetmap.org/wiki/OSM_tags_for_routing/Access_restrictions
> [4] https://wiki.openstreetmap.org/w/index.php?title=Highway_Tag_Africa&type=revision&diff=1337238&oldid=1337236
> [5] https://www.openstreetmap.org/?mlat=58.53671&mlon=125.38264
> [6] https://www.openstreetmap.org/?mlat=64.57219&mlon=142.27424
> [7] https://www.openstreetmap.org/?mlat=-3.68545&mlon=-53.56702
> [8] https://www.openstreetmap.org/?mlat=64.78732&mlon=-14.44138

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