[OSM-talk] Mapping canals

[Dave Stubbs]

On Jan 22, 2008 5:02 PM, Simon Hewison <simon at zymurgy.org> wrote:

> Dave Stubbs wrote:
> > And what is the exact SI equivalent of 30mph?
>
> According to the current UK Highway Code, 30mph = 48km/h.


It's wrong ;-)



>
>
> > I can give you an approximation: 48.28032km/h.
> > What happens though if everyone sticks in 48 instead.. close enough
> > isn't it?
>
> If the UK Department for Transport ever finally get around to finishing
> the
> metrication project that has been going on since 1862. then 30mph will
> probably become 50km/h, 60 would become 100km/h, 70mph would become either
> 110km/h or 120km/h (it's already been lowered, and has become 100km/h for
> buses, which now need speed limiters set to 100km/h).
>

That's all a pretty good explanation of why we need to be adding mph units
to keep the data sane!

Dave
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