Rendering _links is a pain, and the default rendering isn't brilliant at it (it renders all links under all non-links). So I'd definitely err on the side of not using _links unless they are adding some real information.
A good use of _links is to distinguish between the main roads continuing through at speed and the links between the main roads. If you don't have flyovers/underpasses, _links aren't really adding anything (and just make life hard for the data consumer). Some people seem to use _links when a road divides in two approaching a junction. This also causes problems, and I can't really see what value it is adding. Using _links on a simple roundabout is unusual, and unhelpful. What value is it adding? Richard On Sun, Aug 9, 2015 at 2:40 PM, Paul Bivand <paul.biv...@blueyonder.co.uk> wrote: > Noticed some changes that I think odd that appear to derive from mapper > urViator changing highway= primary to primary_link in a gyratory system in > Strood. http://www.openstreetmap.org/changeset/33203852 > > > As I understand the _link versions, these are for short parts of junction > systems rather than substantial chunks of road in the sort of gyratory > systems > that traffic engineers surround town centres with. > > What's evident on the standard rendering is the odd overlaying on the _link > roads of joining roads. I'd have thought that having joining roads was > pretty > much a sign that _link was not appropriate. > > What do people think? > > Paul Bivand (paulbiv) > > > > _______________________________________________ > Talk-GB mailing list > Talk-GB@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-gb >
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