Wake up globetards

Take. From a similar Internet post.
It does not matter if the Earth is flat or curved. You built each pier or support column vertically. Then you join them with the spans which will simply connect to each other. Shape of the Earth is irrelevant because the distance between piers is small and the curvature of the Earth will only mean a difference of several millimeters at most, and likely within construction tolerances so it would probably would not be noticeable at all on each individual span and support. If the supports are all at the same elevation the bridge will be level but if it is long enough it will follow the curvature of the Earth naturally. They don’t have to “engineer” for the curved Earth.