Using only exit_to there is no way to handle junction topologies other than a straightforward highway exit, where there is one "big" through road and one "small" road leaving. What about wrong-side exits? Or where the highway splits into two (or more) roads of equal importance?
Destination tagging is used a lot in the Netherlands, placed on the first segment of each way *after* the node where they split. My Garmin warns me ahead of time which side to keep to, so there doesn't seem to be a need to start the tagging at the first sign (which may be 1km or more before the actual junction). I have not yet found a case where adding destination=* around a junction felt like the wrong thing to do. IMHO destination=* on the ways is the right balance between the rudimentary exit_to on the node and using a relation which will have problems with support/adoption by both mappers and toolmakers. Colin > I don't see any reason to deprecate exit_to, it seems to be the simplest > method of mapping a destination sign on a motorway junction or similar > exit. I use exit_to fairly frequently and it has been a documented tag > for a while (although on the motorway junction page rather than it's own > page) and is also used in JOSM presets. > > I feel it is a less ambiguous tag than destination (as a tag on a way) > as it shows the specific point where a destination is signed, unlike > destination tagged on a way. If you use destination as a tag on a way > then I think you'd need to be sure that at every point along that way > the destination(s) given is the same throughout and if not or you didn't > know you'd need to split the way. The Taginfo stats also seem to show > that exit_to is the most popular of the three different ways of mapping > destinations: a destination relation, exit_to on a junction node, or > destination as a tag on a way. > > A destination relation is also a clear way of mapping a destination as > the intersection and both the 'from' and 'to' ways are part of the > relation, and is particularly useful in mapping situations where exit_to > wouldn't work (like at a crossroads) so I do also use this method. It is > however more complex (and so is unlikely to be a method that a new > mapper would be able to use) particularly where there are multiple > destinations given on a sign which requires a relation for each > destination. > > Cheers, > Paul Williams > (Paul The Archivist) > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > http://lists.openstreetmap.org/listinfo/tagging > _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
