[Talk-GB] inferred single-carriageway NSL?

[MarkS]

Is this because roads with a national speed limit don't have a single 
maxspeed. For example a motorway has a maximum speed of 70mph for some 
vehicles and 60mph for others.

Thus tagging a motorway with say "maxspeed:70mph" (and no other speed 
related tags) doesn't fully represent the speed for all vehicles.

I'm guessing therefore that where roads are tagged this way he is trying 
to setup tags to indicate that 70mph may not be the complete picture and 
that 70mph is taken from national speed limit (the source tag) but that 
this needs checking (the Fixme tag).

It could be that case that once it has been checked he is expecting 
something more like maxspeed:national to be used.


Certainly, I can see that in the areas round me the "maxspeed:60mph" 
ways have been updated by him, but the "maxspeed:national" haven't.


On 13/03/2011 12:27, Dave F. wrote:
> Hi
>
> You've probably seen the numerous edits by chriscf. Can anyone explain
> the purpose of these edits & what the the tags below even mean?
> I've had no reply to an email sent to him a couple of days ago
>
> In my locality, each of his edits already had a maxspeed (with units)
> tag accurately mapped by people on the ground. I don't understand what
> these extra tags add to the OSM's quality
>
> I'm most concerned about the 'inferred' references, which, to me, is no
> better than guessing; something that should not be a part of OSM.
>
> Comment: units in speed limts, add/remove special road status, attempt
> to infer NSL status
>
> Tags:
> FIXME:nsl = inferred single-carriageway NSL - remove this tag once verified
> source:maxspeed = UK:nsl_single
>
> Cheers
> Dave F.