This characteristic derives from the relative stiffnesses between the cable stays and the girder element. Cable-stay designs typically incorporate flexible deck structures without a stiff girder element, and such systems transfer the majority of any applied deck loads directly into the nearest stay cables. In comparison, extradosal designs utilise a substantially stiffer deck/girder structure, allowing the girder to support a significant proportion of any deck loads, and facilitating the distribution of the remaining load between a larger number of individual stay elements. onstant dead load, its live load can be highly variable both in time and position, resulting in fluctuations in the stress level experienced by the bridge's structural elements as the live loading varies. The lower proportion of live load carried by the extradosed cables results in a reduced magnitude of stress fluctuations within the cables, down from typically or above for cable-stay bridges to around for extradosed designs. This has a direct benefit in reducing the detrimental effects of fatigue experienced by the stay cables and their end anchorages, and bridge design codes allow extradosed stay cables to operate at a significantly higher design stress level and therefore material efficiency level as a result. As a result of these characteristics, the "stay cables" on extradosed bridges are not treated as such by the design codes, but are instead considered as "external post-tensioning" tendons that have been deviated upwards from the deck to the towers to increase the superstructure's load capacity over the main supports. Extradosed bridges frequently extend this approach by making the extradosed tendons continuous over the towers via saddle supports and using anchorages only at the deck connections, significantly simplifying the tensioning operations. The Triplets are the first three extradosed concrete bridges in Bolivia. The construction of a beltway allowing traffic decongestion in the city of La Paz was completed in 2010. The new elevated road crosses three parallel valleys with signature bridges. These three consecutive bridges have similar features and as a result are called the Triplets. All three-span structures are made of concrete, with maximum span of 372 feet, featuring extradosed pre-stressed concrete. The structures are built using balanced cantilever segmental construction. The elevation of the bridges reaches heights between 130 and 197 ft above the bottom of the valley, which made a cable-stayed bridge option, with pylons higher than 82 ft above the deck, inappropriate for the site. Therefore, it was proposed an extradosed bridge type, which reduces the height of the pylon, and a single plane of stays to allow a more transparent view.