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

djakk djakk djakk.djakk at gmail.com
Sat Feb 24 09:30:37 UTC 2018

There is 2 « independant » things in the debate :
1) trunk definition - what is a trunk, a motorway-like road - based on
physical characteristics- or a super-primary road - based on the importance
2) wordwilde trunk definition ? - should we have the same definition all
over the world of what is highway= trunk ? (value that are
country-dependant are not that common, aren’t they ?)


Le sam. 24 févr. 2018 à 10:07, Matej Lieskovský <lieskovsky.matej at gmail.com>
a écrit :

> 1) If you want to look at a professional map of Czechia, I'd recommend
> www.mapy.cz over google maps as that is the most used and far more
> detailed map.
> 2) I agree that the discontinuities are ugly, but they reflect the state
> on the ground. That section around Sulec is a trunk instead of a primary
> due to the fact that it is a section of future motorway built to motorway
> standard. While your system heavily preferences "importance" of roads, our
> local system reflects reality. Declaring the entire road from Pilsen to
> České Budějovice as trunk due to its importance loses the information that
> there is a section that was built as a motorway link to Písek. I can
> already tell that the road is important because it links Pilsen and České
> Budějovice (by looking at the map), but I also want to know that it was
> built as a primary road and not as a trunk - that means that I'm going to
> expect more single-level junctions and only two lanes for most of the way.
> I agree, our trunk roads are a little fuzzy on their definition, but
> elevating random primary roads to trunk is a loss of data for us. Touching
> anything else than reclassifying primary to trunk et vice versa will
> certainly be considered as vandalism in Czechia.
> You are demonstrating that you can guess the road class from other data. I
> think it's cute, but does not match on-the-ground data in countries where
> road classification is well-defined.
> Look, I've spent a lot of time on this and I have better things to do.
> Fill in the info for your regions on the wiki and then we can see what we
> can do. Until then, bear in mind that "harmonising" European roads will
> likely get you banned. I don't want to sound like I'm threatening you, but
> I've probably spent all the time I'm willing to spend on arguing with some
> random person who wants to break our local road classification system
> "because it will look nicer".
> On 24 February 2018 at 07:59, djakk djakk <djakk.djakk at gmail.com> wrote:
>> Yes, but this rendering does not change when a road crosses a border ^^
>> djakk
>> Le sam. 24 févr. 2018 à 05:43, JB <jbosm at mailoo.org> a écrit :
>>> There is something I don't get.
>>> Draw primary the same color as trunk and you have no more «
>>> discontinuity »?
>>> In France, some commercial map (the most sold, I think) use a different
>>> rendering for trunk and primary, because you drive faster on trunks. I
>>> like it, I think they like it, because they have been using this
>>> rendering for decades.
>>> JB.
>>> Le 24/02/2018 à 04:45, Fernando Trebien a écrit :
>>> > As an exercise (and I'm curious about your thoughts on this), I found
>>> > the main routes between place=city within Czechia (didn't have time to
>>> > include cities in adjacent countries, bear that in mind).
>>> >
>>> > Here's the result [1] using the old colour scheme (motorway=blue,
>>> > trunk=green, primary=red; with a little mistake: secondary=yellow).
>>> > Top image uses the current classifications, and bottom image is the
>>> > result if city-city routes are classified as trunks. Looks very
>>> > similar to most other maps. Just by looking at it, it's quite obvious
>>> > which is the main route between each pair of cities. As expected, the
>>> > method also found out the best ways through and around Praha when
>>> > going across it. This could also be slightly improved - for example,
>>> > with little extra time, it is easier to recommend going through route
>>> > 6 and then Karlovarská than through route 5 and Bucharova.
>>> >
>>> > I've checked the three small secondary segments using Street View.
>>> > Their physical structure is quite good. If still considered
>>> > undersirable, there are alternative main ways that increase the total
>>> > time of travel very slightly. Not all routers agreed on taking them
>>> > anyway.
>>> >
>>> > [1] https://i.imgur.com/qFGSveX.jpg
>>> >
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