On 2014-03-10 18:14, Glenn Plas wrote :
> On 10-03-14 18:03, Ben Laenen wrote:
>> On Monday 10 March 2014 17:48:06 André Pirard wrote:
>>> According to IGN/NGI and the reasoning below, Benedestraat N211a is
>>> (officially) a secondary road.
>>>
>>> The first question is; what is a "primary/secondary/tertiary road?".
>>> And why is it useful to know? To make better GPS routing?
>> The current conventions are written more or less down here
>> http://wiki.openstreetmap.org/wiki/WikiProject_Belgium/Conventions/Highways
>>
>> (but the bit written after tertiary about suffix letters isn't really
>> correct,
>> and the bit on trunk roads could be changed a bit to include express
>> roads
>> that aren't motorroads but don't allow pedestrians and cyclists)
>>
>> So we're using the road numbers to decide on secondary/primary. These
>> rules
>> are up for debate but the problem is getting better definitions so we
>> don't
>> risk getting into a discussion for every possible road where one
>> person would
>> classify a road primary, while another one thinks it's secondary etc.
>> (*)
Thanks for drawing my attention to that table ;-)
So, I think that the IGN/NGI classifications are more or less the same.
They're based on kind of traffic (main/link/local),
IGN/NGI
OSM
motorway
motorway
national
primary
link
secondary
local
tertiary or residential
but that OSM-be based on digits is different
OSM-be
OSM
1 or 2
primary
2 or 3
secondary
tertiary or residential
OSM-be can raise dispute for Nxx or for special cases.
IGN/NGI does not, but it can be plain wrong.
Speaking of my two-road comparison, that one where lorries can hardly
cross each other is red and where they have no problem it is brown.
Replying to Glenn below, pretty colors on the map are pretty but I think
there is more important.
The most important in my eyes is the number one OSM application: OSM GPS
routing.
And that brings me back to road width.
What could be more useful and less disputed than road width which, in
addition to surface, makes the perfect data for routers, tell me if I'm
wrong or if I forget something?
5m macadam vs 6m macadam.
Simply measured on Bing with JOSM measurement tool.
I will check.
Cheers,
André.
>>
>> The current rules aren't perfect but they generally give maps that are
>> satisfactory, since all important roads are managed by our regional
>> government
>> and thus have road numbers, and thus are at least secondary.
> I think in this specific case that OsmAnd_pieter is actually correct
> to change this road into secondary. But I don't think it's _that_
> important (between 2nd or 3rd). Let's be a sinner and think of 'the
> map' displayed as it is. Trunk roads, Highways and primaries are
> displayed with enough contrast. (green, blue , red).
>
> The difference between 2nd and 3rd is hardly visible, I would say
> he's right. I live in the area so I know what road that is and it's
> an important one over here, so making it secondary isn't that far of
> reality.
>
> Glenn
>
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