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
Cirque de Navacelles Cirque de Navacelles The Cirque de Navacelles is large erosional landform, an incised meander, located towards the southern edge of the Massif Central mountain range in France. It is located near Saint-Maurice-Navacelles and Blandas between the Hérault department and the Gard department. The cirque is isolated, with only a few small villages in the surrounding area. However, with the completion of the Millau Viaduct in 2004 and the A75 motorway between Clermont-Ferrand and Pézenas, tourism in the region has increased. The area is an example of a dissected plateau in which the Vis River eroded a deep channel through the