I found such a photo on the Internet and became interested in what function such a structure could perform.
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Coquihalla highway has something like this to keep avalanches and rocks off the road.
It’s the only tunnel I’ve driven that has windows.
Great Bear Snow Shed https://maps.app.goo.gl/HJUSEtGB2Jg8FFTN7
Italy and austria have a lor of those because of the mountains.