Viewed perpendicularly to the line of the bridge, the cables are usually either arranged in a single-plane or two-plane system (as shown in the figures below). Single-plane is commonly employed with a divided road deck, and requires only a narrow pylon and pier. the deck itself generally has a hollow box cross section to provide torsional resistance across the deck width. In the two-plane system the cable can either he arranged to hand vertically or slope towards the top of the tower or pylon, the connection to the deck being through the outside edges.
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