"How long did it take engineers to realise that cross brace lattices do NOTHING ?"
I beg to differ - cross brace lattices can add up to 75% of weight to the overall structure - thus effectively giving gravity that extra "hand hold" to keep the structure on the ground. Build it without cross brace lattices - there's a good chance your bridge will float off into space. Escape velocity not withstanding, of course.
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