[Tagging] Highway=*_link roads at Y-junctions and roundabouts?

Markus selfishseahorse at gmail.com
Sun Dec 16 22:05:18 UTC 2018

On Sun, 16 Dec 2018 at 01:24, Joseph Eisenberg
<joseph.eisenberg at gmail.com> wrote:
> While checking the rendering of highway link roads (eg motorway_link,
> primary_link, tertiary_link), I noticed that in some cases these tags
> are used when a road splits in a Y-junction, for example before a
> traffic circle / roundabout. In some areas these are the most common
> forms of _link for less major roads, eg secondary_link and
> tertiary_link.

I'd say that a road is only a highway link if it doesn't belong to one
or the other road. For example, this roundabout entrance


clearly belongs to the secondary road 144, whereas this road section


which bypasses the roundabout, belongs neither to the secondary road
144 nor the primary road 9. And regarding this short road section at
an intersection


it's also clear that it geometrically belongs to Avenue de Blonay
instead of Rue des Chenevières.

> Examples of tertiary_link used at a roundabout (rendered thinner in
> these examples)
> https://user-images.githubusercontent.com/42757252/50000948-8e4c7c80-ffde-11e8-8718-3446aefe7ab6.png

As in my examples above, i'd tag the bypass in the southwest _link,
but not the entrances and exits of the roundabout.

> https://user-images.githubusercontent.com/42757252/50000961-9a383e80-ffde-11e8-8d7a-cd85f4dbf125.png

Again, i wouldn't tag the roundabout entrances and exits _link. Those
are just short road sections that are dual carriageway.

> Here are some debatable places where a tertiary_link might be tagged
> at a Y-junction:
> https://www.openstreetmap.org/node/412162671

Seems fine to me without _link.

> https://www.openstreetmap.org/node/2539835932

There's just a triangular painted island, that means it's just one
carriageway. Therefore i'd rather not map two one-way road sections
there (see https://wiki.openstreetmap.org/wiki/Highways#Carriageways).


More information about the Tagging mailing list