In summary, this little tag is much less simple than it may appear at
first
glance! I am very interested in getting a fuller set of this data into
OSM.
Thanks for the 'pedantic' examples of 60mph limits on dual carriageways.
Being pedantic back can anyone demonstrate the existence of a 60 mph sign
on
a single carriageway road?
I can certainly do that. I believe this one was places to "remind" drivers
that, despite having four lanes, it's still a single carriageway and =>
60mph max
http://tinyurl.com/6x5u4la
In this case, it's probably technically "national", but specifically signed
at 60.
I know of a couple of examples of cases on a dual-carriageway where it's
specifically signed 70mph AND most definitely not the national speed limit.
http://tinyurl.com/66pucm7
The reason it's not the national speed limit, is because of the way that the
legal orders that created this stretch of road were drawn up. In this
particular example, this type of road has no national speed limit - and a
white sign with black diagonal line would mean genuinely derestricted. (It's
a non-motorway special-road in case you're asking - and special-roads only
have a national speed limit if they are also motorways - hence a specific
70mph speed limit order had to be drawn up).
Back to the point in question, however;
Do we *really* need to be tagging national speed limits on individual ways?
E.g. the vast majority of roads ought to be one of;
*residential roads subject to 30mph
*rural roads subject to NSL
(I realise a lot of councils have been cutting lots of roads from NSL -> 50
in recent years, but I'm sure NSLs outnumber 50s on the whole)
Perhaps we could tag the ones that differ from the above - and let
post-processors add national defaults as necessary?
Taken to its extreme, are we going to bother adding surface=paved to every
motorway, motorcar=yes to every road?
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