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
Chishi Bridge for locals. Chishi Bridge The Chishi Bridge is a bridge carrying the G76 Xiamen–Chengdu Expressway over a deep valley. At the longest span is longer than France's Millau Viaduct, which has a similar structure, but is longer and higher than the Chishi Bridge. On June 10, 2017, the "New York Times" offered the Chishi Bridge as an example of one of China's many troubled bridge projects. They reported that the bridge's construction was significantly delayed, and went fifty percent over budget. In addition, they reported that, once complete, the bridge was under-used, because the toll, equivalent to $3 USD, was