The project is located in Gryon on the RC 719-B-P cantonal road, which links the communes of Ollon and Gryon between the bridge over the Gryonne and La Barboleuse. On this winding stretch, the cantonal road runs alongside the Bex-Villars-Bretaye (BVB) railroad line on the same platform, with no physical separation.

The aim of the project is to modernize the section by correcting the alignment of the railroad line and the road to give each mode of transport its own space. These improvements involve building a bridge, widening the platform and rebuilding the downstream booms and chutes.

The planned bridge, 160.60 m long with three spans of 65.80 m, 40.80 m and 54 m, will support the railroad, the cantonal road and the sidewalk with 14.70 m wide separation and safety elements. The deck is a mixed structure consisting of a reinforced concrete slab supported on two steel lattice girders connected by upper and lower struts. The concrete abutments and piers are founded on solid shafts with an elliptical cross-section and a depth of 16-18 m to counteract possible movements in the surface layer of the ground. The bridge design is the result of a synthesis of constraints relating to topography, geology, geotechnics, alignment geometry, electrical insulation of the structure and the problem of bridge and track expansion.

The walls are designed with vertical buttresses anchored with prestressed tie rods in the consolidated moraine. The buttresses, spaced at approximately 3 m intervals, form the supports for the 30 cm thick shotcrete wall supporting the upstream terrain. Stone masonry cladding covers the shotcrete wall to preserve the appearance of the old walls and the identity of the line and the mountain road. Prefabricated concrete slats 25 cm thick are laid vertically in front of the buttresses on either side of the anchor heads to conceal them from the view of users.

The spinnerets consist of a solid retaining wall supported on piles spaced 5.50-5.70 m apart and anchored with prestressed tie rods. The slab supporting the sidewalk is cantilevered from the wall.

The 165 m-long Barboleuse boom is designed with buttresses leaning against the slope, supported on piles and anchored with prestressed tie rods. The buttresses, spaced 5-6 m apart, form the supports for the slab and retaining wall under the boom. The downstream face of the buttresses is defined by a fruit that flares out from bottom to top. The prestressed tie rods are housed between two vertical slats. The downstream profile of the buttresses is similar to that of the buttresses on anchored walls.