[Tagging] give way and stop tag for ways

Philip Barnes phil at trigpoint.me.uk
Tue Nov 5 13:19:53 UTC 2013

There are lots of cases where routing software uses turn restrictions, it would be next to useless if it relied on oneways alone.
Phil (trigpoint)
Sent from my Nokia N9

On 05/11/2013 13:09 Balázs Barcsik wrote:

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.

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