Strait of Messina Bridge have made the span more than 60% longer than the Akashi-Kaikyo Bridge in Japan—the largest suspension bridge in the world at . Plans called for four traffic lanes (two driving lanes and one emergency lane in each direction), two railway tracks and two pedestrian lanes. In order to provide a minimum vertical clearance for navigation of , the height of the two towers was to be . This would have been taller than the Millau Viaduct in France (currently the tallest bridge in the world at ). The bridge's suspension system would have relied on two pairs of steel cables,
Route nationale 9 "Parc Natural Régional des Grandes Causses". After crossing the "Col d'Engayresque" (888 m) the RN 9 re-appears and drops into the Gorges du Tarn and onto Millau where the road crosses the river and climbs up to the "Causse du Larzac" offering views of the valley and viaduct. The RN 9 provides a trunk road route avoiding the toll on the Autoroute A 75 as it crosses the valley on the Viaduc de Millau. The RN 9 has again been replaced by the A 75 for this section. At the "Pas de l'Escalette" just South of Le Caylar Roches the