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Then why is the "8 in per mile squared rule of thumb" in the picture? Also on a globe Earth while building a bridge there would be no need for taking the curvature into account. But back to the video I posted a link to, how is that possible on a flat Earth?

don't you understand me at all??the point is that the bridge is build without taking the curvature into account!!understand?!

No I don’t understand. The bridge is obviously not built in one 25 mile long piece but in small segments. So there is no need on a globe Earth to take the curvature into account while building a long bridge. Why do you think there would be?

:'-) i'm speechless,..this is not good for my brain..end of debate

If you claim making a 25 mile long bridge on a globe Earth should somehow take the curvature into account, you also should be able to explain how and why in more detail. And since a bridge is obviously built in small segments there isn’t any need to consider curvature.