IIRC a lot of those tags were added by Chriscf, without any local surveying, and since the value was derived from the speed limit, there's little added value in having separate maxspeed:type values. It's just clutter. What matters to the data user is the maxspeed tag. The maxspeed:type tag is probably only of use to mappers. And not much use to them either.
On Tue, Sep 24, 2013 at 2:26 PM, SomeoneElse <li...@mail.atownsend.org.uk>wrote: > Hi Peter, > > Thanks for replying here. > > Peter Miller wrote: > > > So...on the basis that we should tag what is there, we see a white sign > with a black diagonal line on it then that is what we should indicate. We > do of course interpret that by putting what we believe if the correct legal > speed limit in maxspeed. As such a single carriageway national limit is > coded as "maxspeed:type=gb:national,maxspeed=60 mph". As dual carriageway > is tagged as "maxspeed:type=gb:national,maxspeed=70 mph". The motorway > version is "highway=motorway,maxspeed:type=gb:national,maxspeed=70 mph". > > > I understand the potential problem (does a national speed limit dual > carriageway slip road count as a dual carriageway or not?) but am concerned > that changing e.g. "GB:nsl_single" to "gb:national" will: > > o potentially obscure any underlying data errors (imagine something tagged > "maxspeed=70 mph, maxspeed:type=GB:nsl_single") > > o make things more difficult for data consumers (if only by changing the > data from something that they might be expecting) > > o confuse new mappers who see data that they've entered being changed > because it's "wrong", when in reality there really isn't a concensus on > this. > > I fully accept that national speed limit tagging in the UK is a mess (at > the time of writing 4 of the top 6 values for > http://taginfo.openstreetmap.org.uk/keys/maxspeed:type#values could mean > the same thing) but any consolidation must proceed following discussion. > > With regard to the other point: > > For avoidance of doubt, all my edits have been fully manual. > > > I don't believe that anyone has suggested otherwise, although I have > certainly suggested that you may not have visited all of the places that > you have been changing the speed limit for. There is clearly a sliding > scale between "I've surveyed an area, and everything that I've edited is > based on the results of that survey, aided by e.g. Bing, OSSV, and other > named sources" and "I've changed a bunch of tags worldwide based on who > knows what information without even looking where I've changed them". > > The wiki's "mechanical edit > policy<http://wiki.openstreetmap.org/wiki/Mechanical_Edit_Policy>" > (as currently written) suggests that changes of this type may be covered > ("search-and-replace operations using an editor... unless your changes are > backed up by knowledge or survey") - I guess that it depends on what you > mean by "knowledge" **. > > Clearly no-one's going to object to some tag-changing edits > (designation=public_fooptath to designation=public_footpath for example) > but in this case there's enough doubt - other mappers have said "I think > the changes should reverted" and "This tag is vital" in the replies to my > original mail. > > Based on that, where you've changed e.g. "GB:nsl_single" to "gb:national" > would it be possible for you to revert your changes? There's clearly a > discussion to be had going forward about which one of GB:blah, UK:blah, > gb:blah and uk:blah we need to keep, but based on the replies so far there > doesn't appear to be a concensus to support merging of everything into > "gb:national". > > Cheers, > > Andy > > ** In which case quite possibly mea culpa for the changesets that I refer > to > here<https://lists.openstreetmap.org/pipermail/talk-gb/2013-September/015227.html>- > it's not black and white. > > > _______________________________________________ > Talk-GB mailing list > Talk-GB@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-gb > >
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