Dialogue

Since the genesis of the project, Île-de-France Mobilités has been committed to involving the public and local stakeholders in the studies.

In 2014 - 2015, Île-de-France Mobilités organised a preliminary consultation under the aegis of the National Commission for Public Debate (CNDP), aimed at presenting the project and allowing the public to express its advisability.

In 2022, Île-de-France Mobilités presented the project to a public inquiry, under the aegis of an independent commission of inquiry appointed by the Administrative Court of Melun. This survey was well attended: the State did not declare the project to be in the public interest, but recognised its general interest and asked the project owners to carry out further studies.

Since 2025, following the vote to finance the resumption of studies, Île-de-France Mobilités and RATP have been resuming studies to develop the project, guided by the lessons of the 2022 public inquiry. A new preliminary consultation will be held from 5 October to 11 December 2026, under the aegis of the National Commission for Public Debate, whose three designated guarantors — Nathalie Durand, Marie-Liane Schützler and Caroline Werkoff — will ensure the sincerity of the information and the quality of public participation.