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

Michael Booth boothym at gmail.com
Tue Dec 18 22:51:19 UTC 2018

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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