When does a tunnel need to have a man_made=bridge on top?

How you decide?
I guess size has something to do with it. Does it matter what can go under? Bikes, cars, boats?

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/when-does-a-tunnel-need-to-have-a-man-made-bridge-on-top/3303