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 : [EMAIL PROTECTED] [mailto:talk- > [EMAIL PROTECTED] De la part de Ben Laenen > Envoyé : lundi 8 septembre 2008 17:37 > À : [email protected] > 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 <[EMAIL PROTECTED]> > 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 > > _______________________________________________ > talk mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
