August 6, 2007 (LPAC) - Another key factor in the collapse of bridges today is that a number of bridges built during the post-1967 period were not constructed with sufficient redundancy, so that they could support loads significantly greater than the rated load at the time of construction. Compare this to the Brooklyn Bridge, built by John A. Roebling in 1887, at which time it was constructed to support the traffic of horse and buggies. Nonetheless, Roebling designed the bridge in such a fundamentally sound way, with built-in redundancy, that--though needing replacement--it can carry on operation still today.