[Talk-GB] Maxspeed tagging for the UK

[Steve Doerr]

On 14/04/2011 11:06, Peter Miller wrote:
>
>
> On 14 April 2011 09:59, Steve Doerr <doerr.stephen at gmail.com 
> <mailto:doerr.stephen at gmail.com>> wrote:
>
>     On 14/04/2011 08:21, Peter Miller wrote:
>>
>>
>>     On 12 April 2011 15:39, Steve Doerr <doerr.stephen at gmail.com
>>     <mailto:doerr.stephen at gmail.com>> wrote:
>>
>>         On 12/04/2011 15:16, Ed Avis wrote:
>>
>
>
>>             However, one flaw is that the speed limit sign is not for
>>             'dual carriageway
>>             limit applies' but rather 'national speed limit applies'.
>>              So we still would not
>>             be tagging exactly what appears on the sign, but adding
>>             some additional
>>             interpretation.  I think that is fair enough, but those
>>             who hold to a strict
>>             on-the-ground principle may disagree.
>>
>>
>
>>         I was going to make the same point.
>>
>>         maxspeed:derivation=national_dual|national_single|motorway|restricted
>>         ?
>>
>>
>
>>     I think we are getting there. Two points:
>>
>>     1) The phase maxspeed:type has already be proposed and is in use
>>     in some places. Can I there suggest maxspeed:type rather than
>>     maxspeed:derivation. I think that will also be more
>>     understandable to people who's first language is not English.
>>
>>     2) In place of 'national' can I suggest 'GB:' to fit with
>>     international conventions.
>>
>>     Which brings one to the following:
>>
>>     maxspeed:type=GB:dual|GB:single|GB:motorway|GB:restricted
>>
>     But that then negates the point Ed was making and that I was
>     agreeing with: that the sign says 'national speed limit applies'
>     for the first two. So my suggestion conveys two pieces of
>     information in one tag:
>
>     - the road is subject to the national speed limit (because of a sign);
>     - the road is dual or single as the case may be (because the
>     mapper has observed it to be so).
>
>     It also preserves explicitly the distinction between the national
>     speed limit (60 or 70, special sign) and the 30 mph 'restricted
>     road' limit.
>
>     I don't mind 'type' for 'derivation', and the GB: prefix makes
>     sense. I believe GB is the ISO code for the UK, not necessarily
>     restricted to Great Britain (the British Isles minus the island of
>     Ireland).
>
>
> So the proposal is now:
>
> maxspeed:type=GB:national_single|GB:national_dual|GB:motorway|GB:restricted
>
> My only comment is that it is a little long,

Which is perhaps why the much-maligned bot-writer used NSL instead of 
national!

-- 
Steve
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