[HOT] Trunks in Highway Tag Africa

Rafael Avila Coya ravilacoya at gmail.com
Tue Jan 26 14:36:44 UTC 2021

National tagging conventions prevail, unless they are too far from the 
general highway=* tagging wiki.



O 26/01/21 ás 15:29, Ralf Bernhardt escribiu:
> South American communities have established their own rules.
> What if Highway Tag Africa conflicts with national tagging conventions?
> https://wiki.openstreetmap.org/wiki/Namibian_Tagging_Standards
> https://wiki.openstreetmap.org/wiki/Highway:International_equivalence
> Am 26.01.21 um 14:02 schrieb Fernando Trebien:
>> On Tue, Jan 26, 2021 at 7:51 AM Jean-Marc Liotier <jm at liotier.org> wrote:
>>> With primary currently being the top of the topological hierarchy, what
>>> objective criteria would differentiate it from trunk if trunk becomes
>>> defined as "even more important than primary" ?
>> As in Europe and in the Anglosphere, objective criteria probably
>> should vary by country as conditions are not uniform across the
>> continent. I mention the Anglosphere because the communities of
>> countries like Canada [1] and Australia [2] have developed their own
>> set of rules based on the more general descriptions of the English
>> wiki.
>> Recently in Brazil, [3] we adopted the rule "the main paved route
>> between any two cities/towns with more than 200k people is trunk, the
>> main paved route between any two cities/towns with more than 20k
>> people is primary." This mainly assigns trunk to national routes and
>> primary to regional routes in developed areas while working around
>> oddities (when a regional route was built and a nearby national route
>> was not and the regional route currently replaces its function and the
>> national route will not be built soon and people use the regional
>> route heavily because it is the best option locally) and without
>> leaving large areas of the territory without a trunk network (which is
>> the result I would expect in Africa if the current definition in
>> Highway Tag Africa is applied to all places on the map in Africa). In
>> Brazil, the resulting network is also highly correlated to maintenance
>> frequency (which is strongly correlated with traffic intensity), which
>> is a desirable property for optimal and safe driving. Two mappers
>> independently assessed the resulting trunk network (if we had a third
>> person, it would be even better), checking each other's work to ensure
>> that main routes are chosen correctly and that none are missing and
>> that none are mistakenly included unnecessarily, then they presented
>> the result to the local communities, who suggested some adjustments
>> (mainly replacing short stretches with poor infrastructure with better
>> alternatives nearby). This will likely require continuous fine-tuning.
>> Something similar happened independently in Argentina. [4] The idea
>> for this was based mainly on descriptions on the wiki of other
>> communities and on the idea that classification should be done mainly
>> by importance instead of physical attributes, [5] and it also
>> corresponds mainly to the functional classification manual provided by
>> the Brazilian national infrastructure authority (which does not
>> publish the resulting classification). The main point is that a
>> divided "motorway-like" road is not necessary where traffic is not
>> intense, and even a 2-lane single carriageway (1 lane per direction)
>> may be the best road available for hundreds of kilometres in some
>> places and vital for the region they cross.
>> In Bolivia, the local community applies highway=trunk to any national
>> route, regardless of whether it is paved or not. You can check the
>> unpaved ones in this image [6] or using an Overpass query. [7] The
>> inclusion of unpaved ways in the trunk network was rejected in Brazil
>> and Argentina, which managed to pave their most important roads (with
>> some exceptions in the North Region of Brazil). It makes some sense
>> that the Bolivians want to have their highway classification this way.
>> Since the "problem" with these ways is described on the map using
>> surface=*, applications should be able to make sense of them.
>> In Uruguay, the government provides the classification of roads. [8]
>> AFAIK, none of the trunk roads there are officially restricted to
>> motor vehicles [9] and most are only 2-lane single carriageways (1
>> lane per direction). Even so, they are very safe and offer excellent
>> mobility. The population density is low, so traffic intensity is low,
>> so there is no need to build expensive roads beyond this standard,
>> except near the metropolitan area of Montevideo. This is similar to
>> the situation of the trunk roads that cross the Outback in Australia,
>> such as Stuart Highway. [10]
>> In the UK, route A537 [11] is considered one of the most dangerous,
>> [12] not being restricted to motor vehicles and its characteristics
>> [13] may be below those required for highway=trunk on Highway Tag
>> Africa, but it has been highway=trunk in the UK for years. So, again,
>> Highway Tag Africa seems to promote the high standards of some
>> countries that are not even adopted by some other developed countries
>> with abundant infrastructure.
>> [1] https://wiki.openstreetmap.org/wiki/Canadian_tagging_guidelines#Trunk
>> [2] 
>> https://wiki.openstreetmap.org/wiki/Australian_Tagging_Guidelines#Unsealed_and_4wd_Roads_.28Dirt.2C_Gravel.2C_Formed.2C_etc.29 
>> [3] 
>> https://wiki.openstreetmap.org/wiki/Brazil/Classifica%C3%A7%C3%A3o_das_rodovias_do_Brasil 
>> [4] https://forum.openstreetmap.org/viewtopic.php?pid=711105#p711105
>> [5] 
>> https://wiki.openstreetmap.org/wiki/Proposed_features/Highway_key_voting_importance 
>> [6] https://i.imgur.com/58YMeFA.png
>> [7] https://overpass-turbo.eu/s/12NM
>> [8] 
>> https://wiki.openstreetmap.org/wiki/ES:Uruguay#Correspondencia_DNV_-_OSM
>> [9] 
>> https://www.montevideo.com.uy/Noticias/-Pueden-los-ciclistas-circular-por-las-rutas-nacionales-Hay-un-decreto-pero-no-se-fiscaliza-uc326377 
>> [10] https://www.openstreetmap.org/?mlat=-23.02974&mlon=133.61183
>> [11] https://www.openstreetmap.org/?mlat=53.2508&mlon=-2.0108
>> [12] 
>> https://www.dailymail.co.uk/news/article-1290797/Britains-dangerous-road-named-A537.html 
>> [13] https://goo.gl/maps/Ag68KgNEGd6sPdTq7
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