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 Millau Millau (; ) is a commune in the Aveyron department in the French Occitanie region in southern France. It is from the Aveyron prefecture headquarters in Rodez. It is located at the confluence of the rivers Tarn and Dourbie. It is surrounded by the landscapes of Gorges du Tarn, Causse du Larzac and Causse Noir. It is part of the former province of Rouergue where they also communicate through a form of Occitan language: the Rouergat dialect. Its inhabitants are called Millavois and Millavoises. The territory of the municipality is part of the Regional Natural Park of Grands Causses.