[OSM-talk] Highway=trunk : harmonization between countries ?

djakk djakk djakk.djakk at gmail.com
Wed Aug 23 09:54:41 UTC 2017

I think there are five keys to tag a road :
1) its importance in the network (super-primary, primary, secondary ...)
2) its administrative class (motorway, mottorrad)
3) its physical characteristics (example : no at-grade intersections)
4) the width of its lanes
5) its surface

The current tagging system shuffles those 5 keys, "motorway" implies 2)
motorway signs 3) no at-grade intersections 4) large lanes 5) asphalt
surface, but for 1) it could be super-primary or just primary (think about
suburban motorways network).


Le mer. 23 août 2017 à 11:14, djakk djakk <djakk.djakk at gmail.com> a écrit :

> The thing is, I'm annoyed when there is a primary in the middle of a trunk
> road (example : https://www.openstreetmap.org/#map=12/44.3996/-70.9439)
> whereas in the U.K. this does not exist ... tagging rules should be as
> generic as possible, should not they ?
> djakk
> Le mer. 23 août 2017 à 01:26, Greg Troxel <gdt at lexort.com> a écrit :
>> djakk djakk <djakk.djakk at gmail.com> writes:
>> > Yes Martin, I meant "physical characteristics". In the US, a road is
>> tagged
>> > "trunk" according to its physical characteristics, as Greg said
>> previously
>> > in this thread.
>> That's true, but it's also the case that the roads that are (properly)
>> tagged trunk are also worthy of being tagged primary in importance to
>> start with, plus becuase of the faster nature of trunk tend to be even a
>> little more important.  So while choosing between primary/trunk is based
>> on physical characteristics, it's not really in conflict with the notion
>> of importance.  Basically you can view trunk as "primary with honors"
>> and not be too far off.
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