ACHERES - Boucle de Chanteloup - Liaison routière RD30-RD190 - Construction de la liaison et du Pont. Phase 4 : Travaux de requalification de la RD30 - commune d'Achères et Poissy

The Département des Yvelines awarded a contract to COLAS ETABLISSEMENT SNPR CONFLANS on 3 June 2026 for €16.12 million to requalify RD30 in Achères and Poissy, comprising widening two sections to dual carriageways (North and Centre sections totalling 1,380 m) and raising the South section above flood level. The works include cycle paths, drainage, acoustic screens, and flood management measures, with a 3-month preparation period followed by 24 months of execution.