Why is such a tunnel needed?

funny@lemmus.org to Ask Lemmy@lemmy.world – 703 points –

I found such a photo on the Internet and became interested in what function such a structure could perform.

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It's not finished. It will look like this when they complete it. It's a nature bridge.

If a duct that transfers water is an Aquaduct, then a duct that transfers nature is an Ecoduct

In that case, the bridge in OP's image is currently just an airduct.