[Talk-GB] maxspeed field - what units should we use. etc

[Simon Ward]

On Thu, Jun 04, 2009 at 08:45:20AM +0100, Peter Miller wrote:
> I have been looking at the coverage of maxspeed limit data for highways 
> in the UK and we seem to have a right mix of styles.
>
> Here is the data for bug chunk of England while avoiding including  
> anything from France or Ireland (which would include km/hour figure). We 
> current have over 17,000 highway ways tagged with maxspeed and also 300 
> ways tagged as 'maxspeed:mph'. You will notice that for 30 miles per hour 
> we have 30, 30mph, 30 mph, 48.2, 48.28,  48.280, 48.27808, 48.28032 and 
> 48.28.
>
> Any suggestion on what we should recommend for the UK?

I suggest that whatever method we use also be used for other limits,
such as maximum heights.  The difference with maximum heights in the UK
is that both a height in feet and inches, and a height in metres are
often given, and they don’t convert, even to the point of metric heights
varying for the same imperial heights (though not by much).  I don’t
know that this is the case for speed limits somewhere in the world, but
does suggest a scheme that allows both values would be better for the
mapper.

Simon
-- 
A complex system that works is invariably found to have evolved from a
simple system that works.—John Gall
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