[Tagging] Classifying roads from Trunk to Tertiary and Unclassified

Peter Elderson pelderson at gmail.com
Sat Aug 10 11:16:22 UTC 2019

Good luck with that!

Mvg Peter Elderson

> Op 10 aug. 2019 om 11:59 heeft Julien djakk <djakk.geographie at gmail.com> het volgende geschreven:
> Hello !
> I've been thinking about this for a long time.
> Classifying roads should be the same all over the world ! :O
> The highway tag shuffles administration grade (in England for example
> or for motorways), physical characteristics / abutters (example :
> residential, motorway), access, and importance (commuting and
> long-distance trip). I think the highway tag should be split into
> those 5 features : admin_level, abutters, access, commute_importance
> and long_distance_importance (by experience, there should be 6 levels
> for importance, from the cul-de-sac road to the main artery).
> Importance tags could also apply to bicycle path and footways :D
> Julien "djakk"
> Le sam. 10 août 2019 à 10:27, Joseph Eisenberg
> <joseph.eisenberg at gmail.com> a écrit :
>> We recently discussed the confusion about unclassified vs residential
>> recently, but a more significant issue is that different countries and
>> regions have a wide variety of practices about assigning the major
>> highway classes, especially trunk and primary.
>> In some countries, including parts of Europe and parts of the USA,
>> highway=trunk is reserved for "expressways" or "motorroads" with
>> certain physical characteristics. However, in England where the tag
>> originated, highway=trunk is used for the main, non-motorway highways
>> in the country. As can be seen by glancing at the rendering of
>> England, these highway=trunk connect just about every place=town in
>> England: https://www.openstreetmap.org/#map=6/53.021/-1.033
>> This means that highway=primary and highway=secondary is used for most
>> other paved roads with one lane in each direction. Many place=villages
>> in England are connected to a  highway=primary and the rest have a
>> highway=secondary. And most hamlets are on a highway=tertiary which
>> connects to larger villages or a town.
>> This leaves highway=unclassified for very minor roads, often too
>> narrow for 2 wide vehicles to pass each other, connecting isolated
>> dwellings and farms. This is how they are like residential roads, in
>> the English system.
>> I would like to adapt this system to Indonesia, where the government
>> has not yet classified most roads below the National level, but the
>> "Jalan Nasional" class of major highways has already been decided to
>> be mapped as highway=trunk.
>> See https://wiki.openstreetmap.org/wiki/Indonesian_Tagging_Guidelines#Roads
>> for an attempt.
>> The idea is that one can determine the classification of highway based
>> on what size of settlements it connects:
>> trunk - connects cities to cities ("National Roads")
>> primary - connects a town to a city or another town
>> secondary - connects a village to a town/city or another village
>> tertiary - connects a hamlet to a village/town or another hamlet
>> unclassified - connect farms / isolated dwellings to a hamlet/vilage
>> or another farm.
>> This system is internally consistent and works well for rendering, as
>> well as for routing.
>> Thoughts?
>> - Joseph
>> (I wish I could review this with other Indonesian mappers, but we
>> don't have an active forum or mailing list)
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