construction of the Val de Bonne retaining structures as well as the earthworks to the right of these structures on the route of the future Gap bypass. Realization of the Val de Bonne works of the central section of the Gap ring road

firm section - retaining structures and soil reinforcement - soil reinforcement structures: reinforcement nails, piles; - retaining structures: nailed walls, reinforced embankments with gabion facings; - the earthworks necessary for the construction of the works and the road platform of the current section and the greenway up to the leveling of the PST; - the disposal of excavated material or its reuse or storage on site; - the access track to the Val de Bonne; - the Oh4e hydraulic structure; - the diversion of the WWTP network of the farm - the drainage trenches; - foot ditches or slope ridge ditches; - the belvedere and its gabions.optional tranche 1 - road works - the construction of the road platform of the current section and the greenway beyond the PST; - the realization of the pavement body (layer of shape and asphalt); - the road joints of the Bonne viaduct (Oa9); - the installation of sleeves and drawing chambers; - slotted gutters and their connection to existing structures; - the earthworks and pavement structure of the greenway from the Aurouze roundabout to the OA9; - horizontal, vertical and directional signage; - restraint systems and guardrails; - various equipment (video surveillance camera, non-intrusive counting device of radar type)