Millau Viaduct slightest movement in the Viaduct, and measure its resistance to wear-and-tear over time. Anemometers, accelerometers, inclinometers, temperature sensors are all used for the instrumentation network. Twelve fibre optic extensometers were installed in the base of pylon P2. Being the tallest of all, it is therefore under the most intense stress. These sensors detect movements on the order of a micrometre. Other extensometers, electrical this time, are distributed on top of P2 and P7. This apparatus is capable of taking up to 100 readings per second. In high winds, they continuously monitor the reactions of the Viaduct to extreme conditions. Accelerometers
Millau had one of the major mediaeval bridges across the river Tarn. It had 17 spans, but after one poorly maintained span fell in the 18th century, the bridge was mostly demolished. Just one span remains, with a mill that is now an art gallery, as testament to this significant trading route from north to south across pre-Renaissance France. In 1999, José Bové, a local Larzac anti-globalisation activist demolished the Millau McDonald's as it was being built, in symbolic protest of the decision by the Court of the World Trade Organization to allow the United States to overtax the import of