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VINCI - 2008 annual report

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290 METRE SPAN ACROSS THE ABYSS<br />

The Grande Ravine viaduct, one of four exceptional<br />

engineering structures along the Route des Tamarins on<br />

Reunion Island, owes its unusual design to environmental<br />

necessity. The structure was required to have no piers or<br />

cable stays so as not to endanger the Audubon’s Shearwater,<br />

a bird species threatened with extinction that nests close<br />

to the site. Reduced to a thin blade of steel, the deck that<br />

overarches the 170-metre ravine is supported by highly<br />

complex civil engineering structures, of which only the<br />

incrementally launched braces are visible.<br />

83

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