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
Aguessac D907 goes north-east from the village to Riviere-sur-Tarn and the D167 goes west by a tortuous mountain route to Saint-Germain. The famous Millau Viaduct (Viaduc de la Garrigue) is on the A75 autoroute immediately to the west of the commune. The commune is mixed forest and high country farmland. There are many streams flowing through the commune: the "Ruisseau de Malbose" forms the northern border of the commune, the "Lumansonesque" forms the eastern border flowing into the Tarn which forms the southern part of the eastern border. The Lumansonesque is fed by the "Barbade" with its numerous tributaries which forms