The nineteenth-century bridge is UNESCO World Heritage and is the southern entrance to the city center and train station. The viaduct has a strong historic character with 24 arches. The bridge is 290 meters long and 45 meters high at the deepest point of the valley.
The project entailed the widening of the road surface of the bridge. A platform has been attached on both sides, resting on supporting pillars anchored in the bridge piers. The extension now serves cyclists and pedestrians; the old cycling path was transformed into a bus lane.