On 06/04/11 14:22, Peter Miller wrote:
Do we have a preference for tagging unrestricted limits in the UK? I
say that because a section of the A1 is beginning to look a bit war
damaged (as in edit war).
It started with maxspeed=national. I changed it to maxspeed=70 mph.
Christcf then added a 'source:maxspeed = UK:nsl_dual' and also
'FIXME:nsl = inferred dual-carriageway NSL - remove this tag once
verified; if this is a Special Road, remove the source:maxspeed tag
and add motorroad=yes'. And now c2r has changed maxspeed back to national!
Here is the way in question:
http://www.openstreetmap.org/browse/way/3994397/history
My preference is to put a numeric speed in the maxspeed field and
something like 'UK:nsl_dual' in source:maxspeed field, however I am
not that keen on a prolonged edit war on this and want to gauge wider
opinion.
If it is ok to put something like 'national' in the maxspeed field
then what text options are appropriate for the UK? 'national' seems
too vague. 'UK:national' or 'GB:national' would fit with the
recommended structure as would 'UK:motorway', 'UK:nsl_dual' and
'UK:nsl_single' however I can find no guidance on that.
Assuming we are supporting these second format then where should the
look-up table be that gives the values? This page is having a go at it
but doesn't seem to be doing a very good job!
http://wiki.openstreetmap.org/wiki/OSM_tags_for_routing/Maxspeed
Incidentally, I have also updated the key:maxspeed wiki page so that
it more clearly represents the tagging recommendations and options
available, in particular it presents the two options for encoding
implicit speed limits well. Can people see if they agree with current
representation of opinion.
http://wiki.openstreetmap.org/wiki/Key:maxspeed
Any thoughts?
I think we should tag what we see on the ground. The sign is national
speed limit, not 60 or 70 mph. The black & white sign does not mean 60
mph or 70 mph for every vehicle, lorries have lower limits for example.
I currently don't tag maxspeed on national speed limits, but this
absence encourages the nonsense that chriscf came up with, so if pushed
I'd use maxspeed:national . All of the roads being discussed are in the
UK, so they do not need UK: or GB: namespaces. This is a geo-database
after all.
--
Cheers, Chris
user: chillly
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