[OSM-talk-be] bridge or tunnel?

[Tim Couwelier]

@Gerard:  don't quite agree - but essentially it comes down in part ot what
Lionel added, about how the structure is built.

A bridge is typically built on two load-bearing bases at either end, and a
platform/arch/.. over it to help carry whatever goes over it.
A tunnel is dug below or pushed through.

In case of my examples: road was first, and at this point the railway was
built on top of it, at a raised level -> hence a bridge. The pillars /
crossbar / load-bearing T-style plates are clearly visible.
The cycleway tunnel was built after, by constructing the concrete elements
and then PUSH it under/through the embankment which holds the trainrails,
making it a tunnel.(and due to how it's built, people do refer to it as a
tunnel)

@joost schouppe <joost.schouppe at gmail.com> Good question. Lionels reasoning
would say it's a bridge, Mine would probably have this as a tunnel. Lionels
feels more accurate there though.I'll just assume that 'landscaping' at
this scale to make it happen is cheating a bit. But it does show my idea
isn't entirely 'bulletproof'.

Op di 28 mei 2019 om 12:29 schreef joost schouppe <joost.schouppe at gmail.com
>:

> Hmm, how about this case:
>
>
> https://play.osm.be/historischekaart.html#18/50.84125/4.03590/dhm_hill-osmroads
>
> https://www.mapillary.com/app/?lat=50.8409878896054&lng=4.035847194701205&z=17&pKey=CemcYfldMKwaCCdn0eK2bQ&focus=photo&x=0.5005982815044207&y=0.34925403860156434&zoom=0
>
> It's a road that was dug under a slightly raised train track, but it looks
> like a bridge. Or is it bridge for the road, tunnel under the train, bridge
> again :) ?
>
> Joost Schouppe
>
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