I would think that oneway=yes or oneway=-1 was required on motorways in order to identify the direction of one-way travel. For roundabouts, it must be easier provided data consumers know the national rules.

Steve

On 24/05/2020 21:26, Volker Schmidt wrote:
I just noticed an apparent contradiction regarding the use of the oneway tag between the wiki pages key:oneway <https://wiki.openstreetmap.org/wiki/Key:oneway> and motorway <https://wiki.openstreetmap.org/wiki/Tag:highway%3Dmotorway> .
The former states:
"Some tags (such as junction <https://wiki.openstreetmap.org/wiki/Key:junction>=roundabout <https://wiki.openstreetmap.org/wiki/Tag:junction%3Droundabout>, highway <https://wiki.openstreetmap.org/wiki/Key:highway>=motorway <https://wiki.openstreetmap.org/wiki/Tag:highway%3Dmotorway> and others) imply oneway=yes and therefore the oneway tag is optional,
the latter states:
"These ways should all point direction of travel and be tagged with oneway <https://wiki.openstreetmap.org/wiki/Key:oneway>=yes" <https://wiki.openstreetmap.org/wiki/Tag:oneway%3Dyes>

What is the agreed standard, if any?

Volker

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