[Tagging] Classifying roads from Trunk to Tertiary and Unclassified

Julien djakk djakk.geographie at gmail.com
Sat Aug 10 09:59:11 UTC 2019

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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