Re: [Talk-GB] Maxspeed tagging for the UK

Steve Doerr Thu, 14 Apr 2011 04:05:34 -0700

On 14/04/2011 11:06, Peter Miller wrote:

On 14 April 2011 09:59, Steve Doerr <[email protected]<mailto:[email protected]>> wrote:


    On 14/04/2011 08:21, Peter Miller wrote:



    On 12 April 2011 15:39, Steve Doerr <[email protected]
    <mailto:[email protected]>> 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 ofnational!


--
Steve

_______________________________________________
Talk-GB mailing list
[email protected]
http://lists.openstreetmap.org/listinfo/talk-gb

Re: [Talk-GB] Maxspeed tagging for the UK

Reply via email to