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Curved Tunnel ceilings are quite strong, as they distribute the pressure of the surrounding rock/soil quite well. So if it is covered with loads of rocks and soil it could probably hold another street passing over.
I think that the overpass needs more powerful supports
Curved Tunnel ceilings are quite strong, as they distribute the pressure of the surrounding rock/soil quite well. So if it is covered with loads of rocks and soil it could probably hold another street passing over.
I suppose it would depend on what is passing over.
Nature bridge