I'm using the motorway_junction node on exits, with the ref and the name as tags. Reasons: it has been done since the early days of OSM, and it looks nice on Mapnik. I'm also using the motorway_junction up to four times per interchange to have the name of the interchange appear on Mapnik (example: http://www.openstreetmap.org/#map=15/51.8726/4.5695). An example of tagging the exact locations of all signposts is shown here: http://wiki.openstreetmap.org/wiki/Lane_assist/Examples/Destination#Sophisticated_variant. Personally, I think that's a bit difficult to map, so I prefer the simple variant
For motorways it's not necessary to know the location of the signposts, since every split is signposted (except for some very few exceptions maybe). However any router supporting lane assist, like TomTom, shows the lane a driver should take. It's at that point where 'obvious connectivity' in conjunction with relations come in. I'm personally no fan of relations, since it's almost undoable for a newbie to edit relations. And in a lot of situations they are not necessary (like a standard motorway exit, in which a 1 lane motorway_link departs from a 2 lane motorway). Sometimes relations can't be avoided. I've written a text on obvious connectivity in conjunction with relations which you can find here: http://wiki.openstreetmap.org/wiki/User:It%27s_so_funny#Lane_connectivity Cheers, Johan 2014-08-29 21:16 GMT+02:00 Paul Johnson <ba...@ursamundi.org>: > On Fri, Aug 29, 2014 at 12:26 PM, Kam, Kristen <krist...@telenav.com> > wrote: > >> For a while now, the status quo was to use the 'exit_to' tag on the >> node where the signpost would be (bifurcation points typically) when >> representing a signpost location and information. This tag is being >> deprecated (hence this wiki page). Using the destination tag on the ways >> (e.g., motorway_link) can provide one with the signpost information, but >> how would one easily identify the signpost? Are we going to use the >> 'destination%' tags in conjunction with the highway=motorway_junction tags >> on the nodes where the bifurcation point is? This isn't clear in the main >> article for 'Key:destination' >> > > Destinations are supposed to be relations, and the members are pretty > clear. > http://wiki.openstreetmap.org/wiki/Relation:destination_sign#Members > > For the sign itself, I pick the centroid of the sign location (which isn't > necessarily linear to the other members, especially when the sign is not > overhead!). The important (and only required) member is "to". > > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > >
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