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

djakk djakk djakk.djakk at gmail.com
Sat Feb 24 09:39:29 UTC 2018

Matej, you don’t have to answer quickly, you can answer one time per week
if you prefer, the strong arguments will still weight well :)


Le sam. 24 févr. 2018 à 10:30, djakk djakk <djakk.djakk at gmail.com> a écrit :

> 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 ?)
> djakk
> 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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