Good Lord!
That has both tunnel & bridge tags on the same object!
This is not what is being discussed here.
DaveF
On 08/06/2020 11:10, Martin Koppenhoefer wrote:
Am Sa., 6. Juni 2020 um 18:02 Uhr schrieb Dave F via talk
<talk@openstreetmap.org <mailto:talk@openstreetmap.org>>:
Do you have an example?
A simple example for a tunnel (here subway) on a bridge would be this:
https://www.openstreetmap.org/way/757824513
https://fr.wikipedia.org/wiki/Pont_Morand
Whether it's a bridge or tunnel is fairly easily defined by
determining
which is taking the load.
If a tunnel's structure was removed, would whitewater's above it
collapse? If 'yes' then it's a tunnel.
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.
According to the current wiki, "a tunnel is an underground passage for
a road or similar." and also: "tunnel=* is used for roads, railway
line, canals etc that run underground (in tunnel
<http://en.wikipedia.org/wiki/en:Tunnel>). " This doesn't appear to
be exhaustive / complete, tunnels could also run underwater, above
ground and potentially in the future even in space, no?
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
Cheers
Martin
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