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

Matej Lieskovský lieskovsky.matej at gmail.com
Sat Feb 24 09:07:26 UTC 2018


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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