[Tagging] what does maxheight=none mean?
ilpo.jarvinen at helsinki.fi
Mon Oct 27 10:55:11 UTC 2014
On Mon, 27 Oct 2014, moltonel 3x Combo wrote:
> On 27/10/2014, Martin Koppenhoefer <dieterdreist at gmail.com> wrote:
> > 2014-10-27 11:04 GMT+01:00 moltonel 3x Combo <moltonel at gmail.com>:
> >> The maxheight=* tag maps the physical limitation, not the sign (which
> >> can be absent or even wrong). Tagging maxheight=none really makes no
> >> sense.
> > no, the maxheight tag maps the legal restriction (typically derived from a
> > sign, in absence of a sign might be implied by other legal provisions). For
> > physical restrictions use maxheight:physical (in some countries this is
> > even signed).
> True; I was tempted to amend my sentence to note the physical/legal
> nuance, but decided against it for the sake of clarity. In most cases,
> physical and legal maxheight are pretty much the same.
> My main point was that what is signposted on the bridge is just a
> "nice to have hint" from the mapper's point of view. What matters is
> the actual legal/physical limitation.
At least here in Finland the maxheight restriction sign  is posted
occassionally significantly before the bridge without pre-warning distance
extra sign . In such a case the maxheight restriction applies from the
sign onwards legally, so it really matters here also from the mapper's POV
what the sign says. What's even more funny, I even noticed one place where
this difference might affect routing (although the effect is quite limited):
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