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Good Lord!<br>
That has both tunnel & bridge tags on the same object! <br>
This is not what is being discussed here.<br>
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DaveF <br>
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<div class="moz-cite-prefix">On 08/06/2020 11:10, Martin
Koppenhoefer wrote:<br>
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<div dir="ltr" class="gmail_attr">Am Sa., 6. Juni 2020 um
18:02 Uhr schrieb Dave F via talk <<a
href="mailto:talk@openstreetmap.org"
moz-do-not-send="true">talk@openstreetmap.org</a>>:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">Do you have an example?<br>
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<div>A simple example for a tunnel (here subway) on a bridge
would be this: <br>
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<div><a href="https://www.openstreetmap.org/way/757824513"
moz-do-not-send="true">https://www.openstreetmap.org/way/757824513</a></div>
<div><a href="https://fr.wikipedia.org/wiki/Pont_Morand"
moz-do-not-send="true">https://fr.wikipedia.org/wiki/Pont_Morand</a></div>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
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Whether it's a bridge or tunnel is fairly easily defined by
determining <br>
which is taking the load.<br>
If a tunnel's structure was removed, would whitewater's
above it <br>
collapse? If 'yes' then it's a tunnel.</blockquote>
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<div>what I wrote was that - according to some technical
definitions - a tunnel must not have something above it, it
may be sufficient that it is closed and long enough. I am not
sure if we share these definitions in OSM. <br>
</div>
<div>According to the current wiki, "a tunnel is an underground
passage for a road or similar." and also: "<tt dir="ltr"
class="gmail-mw-content-ltr"
style="background:rgb(238,238,255) none repeat scroll 0%
0%;font-size:1em;line-height:1.6"><a
class="gmail-mw-selflink gmail-selflink"
moz-do-not-send="true">tunnel</a>=*</tt> is used for
roads, railway line, canals etc that run underground (in <span
class="gmail-plainlinks" title="w:en: Tunnel"><a
rel="nofollow" class="external gmail-text"
href="http://en.wikipedia.org/wiki/en:Tunnel"
moz-do-not-send="true">tunnel</a></span>).
" This doesn't appear to be exhaustive / complete, tunnels
could also run underwater, above ground and potentially in the
future even in space, no? <br>
</div>
<div>Many current underwater tunnels are also "underground", as
they are often running in a man made structure (embankment
like) on the ground or below the water body/river in the
ground</div>
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<div>Cheers</div>
<div>Martin<br>
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