Why is such a tunnel needed?

https://lemmus.org/post/1783253

Why is such a tunnel needed? - lemmus.org

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

That’s an unfinished nature bridge.
Quite a common feature in Europe. Gives the animals safe passage over busy roads.
not just that but it saves human lives as well by reducing animal collisions.
And the true motive bubbles to the surface. Drivers must be prioritized at all costs.
Pretty silly to think “Oh that’s the human’s true motive, self-preservation! I got you now, you sly humans!”
My point is everyone is talking about how great this is for wildlife but there’s no way they would build this if only the wildlife were benefitting from it.