[OSM-talk] OpenStreetMap routing service

[leblatt]

Just a bit of information about what other countries have similar to a trunk
: in France there is a road category just below motorways, that people
commonly call a "fastway" (voie rapide) and which legal denomination is
"motorcar way" (route pour automobiles). Speed is limited to 110 KMh ( 130
on motorways), usually has a dual carriage way, generally 2x2 ways,
sometimes 2x1, and pedestrians, bicycles, mopeds, horses, etc. are
forbidden. This is what we have closest to a trunk around here, in my
understanding.


> -----Message d'origine-----
> De : talk-bounces at openstreetmap.org [mailto:talk-
> bounces at openstreetmap.org] De la part de Ben Laenen
> Envoyé : lundi 8 septembre 2008 17:37
> À : talk at openstreetmap.org
> Objet : Re: [OSM-talk] OpenStreetMap routing service
> 
> On Monday 08 September 2008, Nic Roets wrote:
> > On Mon, Sep 8, 2008 at 3:23 PM, Lars Aronsson <lars at aronsson.se>
> wrote:
> > > Here you assume that "trunk" is a well defined concept.  But it
> > > isn't.
> >
> > Spot on.
> >
> > And defining things per country leads to all sorts of problem. For
> > example mappers applying domestic rules when visiting foreign
> > countries. Confusion when debugging routing software. Next mappers
> > will omit units of measurement because they feel it it's implied for
> > their country.
> >
> > The solution is for editors to create defaults for these disputed
> > access restriction tags and allow users to change them before
> > committing them to the database.
> 
> I strongly disagree. There are so many country specific rules that it'd
> be naive to think you can twist everything into one system that applies
> world-wide.
> 
> If you're in a country where trunk means a road where no pedestrians or
> cyclists are allowed, then adding that information in the database is
> unnecessary. This makes sure that
> (a) if for some reason the traffic rules change so that the sign
> marking
> that kind of road allows pedestrians, we don't have to edit all trunks
> in a country, and
> (b) it fixes the problem where someone might not be familiar enough
> with
> the traffic rules so he doesn't know for example that pedestrians
> aren't allowed and doesn't add that access tag.
> 
> We've had a similar issue like that recently on talk-be, where mappers
> didn't know the exact meaning of a sign. Something tagged with a sign
> for access=destination in Belgium means: no entry except to the houses
> or fields in that road, and except pedestrians, cyclists and horse
> riders (and a few more exceptions that don't matter here).
> The "pedestrians" part is obvious to anyone over here, the latter two
> aren't. Indeed, you can even find those signs now and then that have a
> redundant "except bicycles" sign under it, so the people putting up
> those signs aren't always aware of that either.
> 
> Now suppose that access=destination would just have the world-wide
> definition so it wouldn't exclude bicycles or horse riders. If our
> mappers don't know the exact meaning of the traffic sign, it would mean
> that all routers would steer you round these access=destination roads.
> So, therefore we can better define this by country (or perhaps state in
> some cases), where the rules are actually made, so this problem won't
> happen.
> 
> Greetings
> Ben
> 
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