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

JB jbosm at mailoo.org
Sat Feb 24 04:40:09 UTC 2018

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.

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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