[Talk-GB] Maxspeed tagging for the UK

Steve Doerr doerr.stephen at gmail.com
Tue Apr 12 15:39:58 BST 2011


On 12/04/2011 15:16, Ed Avis wrote:
> Peter Miller<peter.miller at ...>  writes:
>
>> Are people happy with:
>>
>> GB:motorway (which implies 70 mph at present and possibly 80 mph in the future)
>> GB:dual_carriageway (which implies 70 mph at present)
>> GB:single_carriageway (which implies 60 mph at present)
> I think this is a sensible scheme and can go either into 'maxspeed' (in which
> case client applications will need a lookup table of what GB:motorway means)
> or else into 'maxspeed:sign' (in which case the 'maxspeed' tag contains the
> literal mph value, and will need automated retagging in case the national limit
> changes).
>
> 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 ?

-- 
Steve



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