I think some passages are called a mole pipe, but that makes it not a
tunnel.
Don't have tunnel vision: All your examples are railroad bridges.
A tunnel has mosttimes also a depth: it lies not under, but beneath
something and/or crosses several things.
Also, sometimes a traffic sign F8 can be found near the entrence.
Regards,
Gerard
OSMDoudou schreef op 2019-05-27 21:32:
> If it can help, Wikipedia cites criteria like twice as long as wide and
> "creating a confined area".
>
> https://en.m.wikipedia.org/wiki/Tunnel
> https://fr.m.wikipedia.org/wiki/Tunnel
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> Talk-be mailing list
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