[Tagging] Primary or Trunk?

Fernando Trebien fernando.trebien at gmail.com
Sat Nov 2 19:43:14 UTC 2013

I know that in Germany and in Argentina roads are being classified
based primarily on administration level (national, regional, city,
etc.). Classifying like this probably works well when the entire road
system is well maintained.

In Brazil, however, we had tons of discussions on how to do it and
ended up deciding (though reluctantly) to classify based on several
objective structural characteristics that seemed closely related to
"importance". That is mostly because many regional/municipal roads are
definitely more important (thus, preferable) than other, smaller
national roads. Here's what we ended up with:

On Sat, Nov 2, 2013 at 4:56 PM, Chris Hill <osm at raggedred.net> wrote:
> On 02/11/13 18:47, Jonathan wrote:
>> This question is really aimed at UK roads but the same may apply to other
>> countries.
>> I'm not clear with the distinction of a Trunk road in the UK. The wiki
>> suggests a trunk road is "high performance roads that don't meet the
>> requirement for highway
>> <http://wiki.openstreetmap.org/wiki/Key:highway>=motorway
>> <http://wiki.openstreetmap.org/wiki/Tag:highway%3Dmotorway>" which to me
>> would suggest an A road that is a dual carriageway.  Further on in the wiki
>> it says that any A road in the UK  signed with "Green" signs is a "Trunk"
>> road.
>> I know of many "Green" "A" roads that aren't much more than country lanes,
>> they are definitely not "high performance" and I don't feel they should be
>> "Trunk" roads, I feel they should be "Primary" roads.
> Perhaps you might like to see this question from the help system:
> https://help.openstreetmap.org/questions/228/uk-road-was-detrunked-why-does-osm-still-have-it-tagged-highwaytrunk
> --
> Cheers, Chris
> user: chillly
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Fernando Trebien
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