That totally depends on the surrounding configuration. If land subsidence was as common as security patches, they would totally be doing monthly surveys. Struc

That totally depends on the surrounding configuration. If land subsidence was as common as security patches, they would totally be doing monthly surveys. Structural engineers also don't commonly change structural features after initial delivery; realistically, I would expect changing a two-lane bridge to a four-lane bridge to be more expensive than constructing a four-lane bridge where none exists.