[OSM-talk-be] wiki highway conventions

[Glenn Plas]

On 12/28/2012 01:10 AM, Ben Laenen wrote:
> On Friday 28 December 2012 00:22:17 Glenn Plas wrote:
>> But the general wiki (which is probably USA based if I'm not mistaking
>> here) does say so:
>>
>> http://wiki.openstreetmap.org/wiki/Tag:highway%3Dprimary
>>
>> There is not much room for interpretation except 'large' definition.
> It's not really any country based. The definition is as broad as possible, and
> every country makes its own rules.

Maybe I should have been more specific,  it's just that the person that 
wrote that would have done it from their own point of view and 
location.   Chances where that he/they come from the USA.   A lot of 
assumption of course.
>
>
>> But I understand if you drive over R22 you would classify it primary
>> (although it has 4 lanes divided by a central barrier, not 2). That
>> would be a trunk to me as it connect to the E19 complex in Vilvoorde.
> There are cycleways, so no trunk...

Right again.  Forgot about the cycleway requirement for a second. The 
definition of the word 'trunk' got me there.
>
>
>> As a subnote, the N211 which belongs to that complex goes primary until
>> the city center, that is wrong imho matched against the theory.
> Yeah, N211 should be secondary east of the R22.
>
> West of the R22: makes sense as primary. Strictly following the rules it
> should be secondary of course, but this is one of those possible exceptions.
I'll change that short section soon if we ok on this, but I think it's 
the other way around the east section of R22 at the roundabout should 
remain primary and the west part changed to secondary.
>
>
>>> I guess someone did something similar in Vilvoorde with the R22. Whether
>>> that should be done, not really sure here.
>> That's why I bring it up as I'm not totally sure myself, but when I'm
>> not sure, I check the wiki ...
> And of course the wiki isn't exactly the best reference for it :-) The
> "definition" has been slowly adjusted on the mailing list for example, but we
> can't expect everyone to know the entire history of course...
Since I'm only subscribed recently but active much longer, I'm one of 
them that missed it.

>
>
> I guess I'll make a small summary with some examples (limiting to
> trunk/primary/secondary):
>
>
> * trunk: "expressways", prohibited for pedestrians and cyclists. May be signed
> with F9 (motorroad), but not always. Not all roads with F9 are trunks (e.g.
> tunnels or bridges if the road it is part of isn't classified as trunk)
>
> * primary: Nx or Nxx roads
>
> * secondary: Nxxx roads (or P roads)
>
>
> Exceptions to primary/secondary above:
>
> * ringways (usually R roads, but can be N roads): classification from highest
> classified road that connects to it. Inside R road primary road becomes
> secondary if the ringway deviates the traffic between the *primary* roads.
> Secondary roads stay secondary inside ringways (they don't become tertiary)
> (*).
> e.g. R13 http://osm.org/go/0ErVXu0
This should end up on the wiki, it's good info.
>
>
>
> * everywhere it makes sense... When a road without number connects two parts
> that do for example, or any other weird situation you may encounter.
> e.g. Corbiestraat as primary http://osm.org/go/0ErYW5cL
> Plezantstraat as secondary (no road number) http://osm.org/go/0Ej6EwLs--
>
>
>
> Roads with suffix in their number (e.g. N123a): use your brains. Almost
> every case is unique here so it's impossible to writ down a good rule.
> e.g. N1c http://osm.org/go/0EpMnUUZ--
> N60b http://osm.org/go/0EiFrVaz--
> N15a http://osm.org/go/0EpLMAqA-
> N42c http://osm.org/go/0EiwSJL_-
>
>
> If a N-road really shouldn't be secondary at all, it can be classified
> unclassief/residential (not tertiary, if it can be tertiary it's sufficient to
> be secondary)
> e.g. N408 http://osm.org/go/0EpSSDeg
>
>
>
> (*) note that the previous years a lot of roads in city centers have been
> transferred from the region to the municipalities, and they lost their road
> numbers, so they've become tertiary even though there are probably still road
> numbers found on the street.
>
>
>
> I guess these are the rules we have now. They sometimes allow for some
> discussion in some cases of course, but they do seem to create a nice map.

This should end up on the wiki, it's good info.   I do like the map as 
well as it is now, but I try not let the renderer influence my actions 
(too much) although it plays a role.

Glenn