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

Joseph Eisenberg joseph.eisenberg at gmail.com
Tue Dec 18 23:50:18 UTC 2018


Thank you for the clarification.

(Tagging the Y-junctions and traffic circle entrances results in a small
rendering issue with the current Openstreetmap-carto style, but if is a
tagging mistake we don’t need to change anything.)
On Wed, Dec 19, 2018 at 7:52 AM Michael Booth <boothym at gmail.com> wrote:

> Agreed, a short Y section before a roundabout because there is a small
> bit of painted or physical separation doesn't mean they are _link roads
> - it's still the same through road.
>
> The wiki says "The _link tags are used to identify ... 'channelised'
> (physically separated) at-grade turning lanes connecting the through
> carriageways ... to other roadways"
>
> So this way is correctly tagged as a _link road:
> https://www.openstreetmap.org/way/352297911 /
> https://www.mapillary.com/map/im/5jD0ksQCmHPt11DizKyztA - but the other
> ways connecting to the roundabout aren't, because they are through
> carriageways (you could argue the roundabout is the thing doing the
> linking here).
>
> On 16/12/2018 15:51, Greg Troxel wrote:
> > Joseph Eisenberg<joseph.eisenberg at gmail.com>  writes:
> >
> >> 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.
> >>
> >> On the wiki there was some debate about whether it was correct to tag
> >> a Y-junction as leading into link roads, or if these should only be
> >> used for slip lanes and on-ramps which merge off of or onto the
> >> through-lanes of another road:
> >> https://wiki.openstreetmap.org/wiki/Talk:Highway_link
> > It seems that the Y roads should not be link.  link is about a
> > connecting road used when changing roads, and the last few feet entering
> > a rotary, especially when there is no other choice, does not fit that.
> >
> > In particular, if a road wouldn't be tagged differently at a rotary, but
> > happens to be divided (dual carriageway) the last 50m, then it's fine to
> > make two ways, but not to change the way type.
> >
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>
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