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 Viaduct is direct and without tolls for the between Clermont-Ferrand and Pézenas, except for the bridge itself. The Eiffage group, which constructed the Viaduct, also operates it, under a government contract, which allows the company to collect tolls ("Péage") for up to 75 years. As of 2018, the toll bridge costs €8.30 for light automobiles (€10.40 during the peak season of 15 June to 15 September). Each of the seven pylons is supported by four deep shafts, deep and in diameter. The abutments are concrete structures that provide anchorage for the road deck to the ground in the Causse du Larzac