[Tagging] give way and stop tag for ways

Ilpo Järvinen ilpo.jarvinen at helsinki.fi
Tue Nov 5 11:39:22 UTC 2013

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.


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