[Tagging] give way and stop tag for ways

Balázs Barcsik balazs.barcsik at gmail.com
Tue Nov 5 13:09:33 UTC 2013


Do you think that routing/navigation apps are using turn restrictions tags
instead of oneway tag to create the route?
I dont think so...


On Tue, Nov 5, 2013 at 12:39 PM, Ilpo Järvinen <ilpo.jarvinen at helsinki.fi>wrote:

> On Tue, 5 Nov 2013, Balázs Barcsik wrote:
>
> > Think about oneway
> > tag.http://wiki.openstreetmap.org/wiki/OSM_tags_for_routing
> > That is a property of a way.
> > So as a routing app I just would like to examine this tag, and forget the
> > relations restrictions:
> > http://wiki.openstreetmap.org/wiki/Relation:restriction
> > Because it is a redundancy - if the oneway tag used properly the routing
> app
> > can determine whether you can turn right in an intersection or not. In
> other
> > words - if someone missed defining the road signs at intersections
> > (eg, restriction=no_left_turn) then this does not mean that you can turn
> > left. So I would prefer to create such tags for priority cases - which
> > can be assigned to ways
>
> No, you are simply wrong here. Oneway is a legal concept that really
> applies for the way and it is different from turning restrictions that
> applies to particular combination of traversing on the graph edges (ie.,
> a relation). And you cannot ignore turning restrictions as it by no means
> guarantees that the way itself is oneway legally, just the turning is
> forbidden from the way you're coming from.
>
>
> --
>  i.
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