"because the stress contribution of a human walking on it is basically zero." If that would be the case, armys would still march on bridges. But they don't. h

"because the stress contribution of a human walking on it is basically zero." If that would be the case, armys would still march on bridges. But they don't. https://en.wikipedia.org/wiki/Broughton_Suspension_Bridge https://en.wikipedia.org/wiki/Broughton_Suspension_Bridge