programmed, which ensures its realisation by 2025. It will then require the construction of a third bridge over the Rhône in the north of the metropolitan area (in Bourg-lès-Valence) to complete the ring road that will then form a complete loop: This project is at the stage of preliminary studies and it seems that a passage on the present dam of the CNR is retained in order to minimise the cost. The bridges of Valence During antiquity, the existence of a bridge providing, as in Vienne, the link between the two shores, is likely. Indeed, as early as 1388, the toponym "Pont Péri" [Péri Bridge] is carried by a sector of the quarter of Basse-Ville lying in the extension of the east-west axis of the ancient city. In addition, A. Blanc would have discovered, still in this same extension, piles of oak, closer perhaps to a pier. He also mentioned the "tour de Constance" [Constance Tower], on the Valence shore, a construction already known in the Middle Ages and which bore all the floods of the Rhône. In any case, the existence of a link between the two banks is in no doubt and a crossing point could even have existed at the site of Valence from the prehistoric time. Whether or not that existed, this ancient bridge was not replaced until the nineteenth century. The different successive bridges of Valence, in chronological order, are: The Seguin Bridge built from 1827 (two years after that of Tain-Tournon, which was the first bridge of this type installed in France) and delivered to traffic in 1830. The stone bridge, dating from 1905, destroyed 19 June 1940 by French engineers to slow the advance of the German troops. In August 1940, Rhone is again passable by boat and then a ferry to traille. A temporary bridge was then installed by the engineers. This bridge was again damaged on 18 August 1944 during a bombing by the Allied forces. A temporary suspended walkway installed in 1949 and which was in use until 1967. The Frédéric Mistral Bridge, completed in 1967, is still in service. It joins the commune of Guilherand-Granges (Ardèche) to the city centre of Valence (Drôme). Finally, the Bridge was inaugurated on 18 December 2004, located at the south of the city, is the "second bridge" of Valence, long expected to alleviate the problems of movement between the two banks of the