Speed limit reduced for safety

The maximum speed on the Millau viaduct was reduced from 130 to 110 km/h in June 2005, a decrease of 20 km/h compared to the rest of the highway. This change was made to address concerns about inconsistent driving speeds, which could create dangerous situations for drivers.

Drivers slowed down for observation

The speed reduction was implemented after it was observed that drivers were significantly slowing down to better view the viaduct’s structure. This behavior created potential risks due to the wide variation in vehicle speeds along the bridge.

Viaduct's design and opening

The Millau viaduct, designed by engineer Michel Virlogeux and architect Norman Foster, was inaugurated on December 14, 2004, and officially opened to traffic on December 16, 2004. It is a notable engineering feat with a length of 2,460 meters and a width of 32 meters, featuring 2×2 lanes for traffic.

Engineering details of the viaduct

The structure includes 7 piers, 154 cables, and uses 36,000 tons of steel for the deck along with 206,000 tons of concrete. The highest point of the viaduct reaches 343 meters at the top of the P2 pier, which itself is 245 meters tall. The deck follows a curved path with a radius of 20 km and a slope of 3.025%, creating an elevation difference of about 74 meters between its northern and southern ends.

Construction cost and longevity

The construction of the viaduct cost 400 million euros, and the structure is guaranteed for 120 years. The curved design was intended to improve visibility and provide a more precise trajectory for vehicles, though no official explanation from the designers has been attributed to this specific choice.

Current speed limit and purpose

The current speed limit of 110 km/h remains in place, with the reduction aimed at reducing the range of speeds on the viaduct to enhance safety for all drivers, rather than targeting specific individuals.