[Tagging] [Talk-us] Trunk VS primary,

Fernando Trebien fernando.trebien at gmail.com
Sun Jan 5 15:45:02 UTC 2020

I know this discussion is US specific, but we've struggled with
similar issues in Brazil as well, for very similar reasons. It seems
we've made some progress in the southern region when we chose to judge
importance according to a somewhat simple method (it started as: trunk
= best routes between place=city, primary = best routes between place
= town; then we refined the population targets for each level), with
the cost of requiring some discussion for uncommon corner cases (such
as when the best route between a pair of large cities actually takes
unexpectedly undeveloped roads). Some requirements based on structure
are still in place (primaries must be paved, motorways must be
divided, but trunks don't have to be divided). We've also assumed that
routing quality can only be achieved after mapping speed limits and
surfaces and cannot depend entirely on classification. It is still an
experimental approach, but it seems like mappers and users are much
more satisfied now. For verifiability, after a consensus was reached,
we documented everything in the wiki. It's a lot of work, but maybe
something like this would work in the US as well.

On Fri, Dec 27, 2019 at 3:39 PM Paul Allen <pla16021 at gmail.com> wrote:
> On Fri, 27 Dec 2019 at 17:09, yo paseopor <yopaseopor at gmail.com> wrote:
>> You lost my point of view:(WHICH)  the best (or worst) conditions for a road you can find in a country. In some countries will be seem like a motorway, in other countries or zones will be a sand track. And the other focus: WHO can know these conditions (local communitters, people who lived in the country, etc.) .This is an issue OSM will have to front some day. And some day we will have an agreement about it.
> We're actually conflating several issues:
> 1) Road construction (paved/unpaved).
> 2) Number of lanes.
> 3) Central barrier yes/no.
> 4) Entry/exit types (simple junctions/roundabouts versus motorway on/off ramps).
> 5) Legislation (kinds of traffic, stopping, etc).
> 6) Routeing preference:
>   a) Speed
>   b) Distance
> In some countries, like the UK, these factors are all generally well-correlated.  To
> a degree.  Good routes between important destinations tend to get good roads. Other
> places, good routes between important destinations get bad roads, but they're still
> the best roads around.
> I think we need to start splitting up these attributes into different tags and leave it
> to editors to offer the appropriate combinations for a given country.  Then carto can
> handle different coutries differently.  Preferable two renderings, one aimed at
> construction (motorway down to dirt track) and the other aimed at "good route,
> shame about the surface."
> I now have a quote from Calvin and Hobbes going through my head: "And while
> I'm dreaming, I'd like a little pony."  It's probably insoluble but if it is soluble
> it will take us decades to agree on a solution.
> --
> Paul
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Fernando Trebien

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