A self-anchored suspension bridge is a type of bridge combining elements of a suspended-deck suspension bridge and a cable stayed bridge. One such bridge has been proposed as a replacement for the eastern span of the San Francisco-Oakland Bay Bridge and would be the largest bridge this type constructed. Similar to a cable stayed bridge this type does not impose horizontal tension forces upon its anchorages (the horizontal forces are transferred to the tower, through the deck) - it is considered to be a self-anchored bridge, with its terminal piers providing only stabilizing forces. As with a suspension bridge, the vertical deck loads are transferred to the primary cables by suspender cables. Unlike other suspension and cable stayed bridges the deck of this type of bridge must be supported from below during construction. This particular design has engendered a great amount of engineering controversy and multi-billion dollar cost overruns. It may not be built as illustrated as the costs of construction appear to be too unpredictable, leading to only one very high bid. The proposal by the California Governor to revert to a previous proposal has crated a great political controversy, as the earlier proposal may not save any money and also may cause further delays. See the San Francisco-Oakland Bay Bridge article for additional information.
