[Tagging] Clarification unclassified vs residential

[Peter Elderson]

It's a bit of a mess in Nederland as well - lots of small residential roads
have once been imported as unclassified, under the assumption that
unclassified means there is no official classification. Which was wrong
because unclassified is in fact a classification. As a result, unclassified
in OSM in Nederland now says that the classification is not known: anything
below tertiary can be unclassified.

You cannot deduct anything from unclassified.

Residential just means it has housing along the road.

Unclassified roads within a residential area are probably (but not always)
residential.

Routing cannot rely on this. I would not rely on a router if it relies on
this tag.

Fr gr Peter Elderson


Op wo 20 feb. 2019 om 12:08 schreef Florian Lohoff <f at zz.de>:

>
> Hi Georg,
>
> On Wed, Feb 20, 2019 at 11:03:15AM +0100, Georg Feddern wrote:
> > Even the english wiki says:
> > "The tag highway
> > <https://wiki.openstreetmap.org/wiki/Key:highway>=unclassified is used
> for
> > minor public roads typically at the lowest level of the interconnecting
> grid
> > network."
>
> Yes - An unclassified road is a road which does not have any
> classification. As does a residential not have a classification.
>
>         "Unclassified roads have lower importance in the road network
>         than tertiary roads, and are not residential streets or
>         agricultural tracks."
>
> Lower importance than tertiary - NOT residential. No word about
> beeing of higher importance than residential.
>
> When you continue reading the distinction is that you MAY use an
> unclassified in city limits when there is no residential usage.
>
>         "Public roads of low importance within town and cities that are not
>         residential may also be highway=unclassified."
>
> For me this means that 99% of the roads within city boundarys cant
> be unclassified because there is residential usage.
>
> > As part of the interconnecting grid network it should connect to at least
> > unclassified or higher roads - unless it is a dead end settlement.
> > Tagging a through connecting road only because it is inside a city limit
> as
> > residential makes no sense.
>
> Why not? This enables a routing engine to assume different
> characteristics of roads.
>
> > And usually a connecting road from outside a city limit has at least a
> bit
> > more traffic as an inner-city-only residential.
>
> Have you had a look at the original example images for an unclassified?
>
> https://wiki.openstreetmap.org/wiki/File:Highway_unclassified-photo.jpg
>
> I would not expect more traffic here - I'd expect less.
>
> > So the conclusion an unclassified has a bit higher priority than a
> > residential is not far from reality.
>
> Not in my reality and not in the original OSMs reality. Yes - through
> misleading statements in the German article this might have influenced
> at least the German community to assume otherwise - This is why
> i request clarification.
>
> > Otherwise there is often the problem to tag the main access roads inside
> a
> > bigger residential area.
>
> The region where i map mostly we agreed that we may tag roads with clear
> interconnecting character and wider lanes with one class higher than
> they would have by assuming the strict classification. We agreed
> that the causes by which we tag higher be placed in a note= tag on
> the road.
>
> So a large wide interconnecting road within city limits might be
> a tertiary.
>
> > The practice to tag those as unclassified for a bit higher priority may
> not
> > be optimal - but suitable.
> >
> > This discussion - and usage - is some years old now - and I thought you
> had
> > at least knowledge of it from the german forum.
>
> My knowledge and usage predates the German Forum by years - I was
> astonished
> finding statements in the German article for unclassified which do not
> match
> (but oppose) the English versions which i typically use and prefer.
>
> Its not the first time i find the German articles to contain a hidden
> agenda bei a minority or single mappers trying to steer the community.
>
> Flo
> --
> Florian Lohoff                                                 f at zz.de
>         UTF-8 Test: The 🐈 ran after a 🐁, but the 🐁 ran away
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