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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