This 6-lane bridge crosses a rather flat valley with a little river, a quite usual situation. However sliding subsoil conditions made the founding of piers on one side of the valley difficult and costly. Therefore we proposed a 258 side span combining a cable-staying from above and propping from below, winning with that first prize in a competition.
This combination halves the pylon height of a standard cable-stayed bridge, without increasing the cable forces. The low pylon and the overall lightness of this large bridge blend well with its pre-alps surroundings.