In your letter dated Sat, 11 Oct 2008 12:57:18 +0100 you wrote:
In the UK with bridge heights there isn't an exact conversion factor -
mainly because a signed 11'3 bridge isn't 11'3 high. To get the signed
height - you subtract 3 inches from the true height then round down to the
next 3 inches.
Mappers should be mapping what it is they find. If I find an 11'3
clearance bridge with a 20mph limit beneath it then that is what I
want to map.
Nobody is suggesting you shouldn't do that. I'll certainly express the
view that when I drive under that bridge, my km/h speedometer and lack
of
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