[Tagging] when should highway=centreline be used?

André Pirard a.pirard.papou at gmail.com
Tue Oct 27 21:01:30 UTC 2015


On 2015-10-27 08:50, Gerd Petermann wrote :
>
> Hi all,
>
>
> we have 153 ways tagged
>
> highway=centre_line
>
>
> The wiki describes that as the white stripes in the middle of a road.
>
> I looked at some ways tagged like that and they all seem to
>
> be barriers between large roads (motorway,trunk), e.g.
>
> http://www.openstreetmap.org/way/118699380
>
> This way
>
> http://www.openstreetmap.org/way/117153052
>
> is also tagged type=oneway. No idea what that would mean.
>
>
> My understanding so far:
>
> The tag makes no sense, editors use it instead of barrier=hedge
>
> or something similar.
>
> In Germany we have a traffic_sign that warns drivers when
>
> the white line is missing, e.g. because the road was recently repaired.
>
> I think if one wants to map this, it should be an attribute for the
> existing
>
> highway, not a new way. I think the tag centreline=* is used for that
> (130 times).
>
>
> Gerd
>

Hi,

OSM will always surprise me.

Here in Belgium, what is called the "white line" is of uttermost importance.
And I suppose in most other countries too.
I've been looking for it in vain in the wiki and now it surges.
But, first of all, we must distinguish a striped line, as said above,
and a continuous white line.
What I say relates to the continuous line.  That line means:

  * that overtaking is forbidden
  * that turning left is forbidden (for right side driving)
  * and of course also that U-turn is forbidden
  * but also that turning left is forbidden when coming from a crossing

Hence, it may replace many complicated turn restrictions very simply.
And instead of "replace", I should say "add" because they're often missing.

(because making relations is difficult)
For a simple 2-lane road, it would best be a tag of the highway, not an
additional line.

The downside is that it would produce many splits.

The most surprising is that it seems to be a one man's tagging
assimilated to a hedge !!!

Cheers

André.







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