Question 2676 — urban transport

Summary

Mr. Jean-Didier Berger questions the Minister Delegate to the Minister for Partnership with Territories and Decentralization, responsible for transport, on the planned study of an extension of line 4 of the Paris metro towards Verrières-le-Buisson. This project for the southern extension of line 4 of the Paris metro, which currently stops at Bagneux, could ultimately make it possible to connect with the T10 tramway and to serve areas poorly equipped with public transport. The extension presents significant advantages, such as the optimization of the main RER B line, which is very disrupted, by removing the short branch of the RER B between Bourg-la-Reine and Robinson. Thus, all of the trains would use the main line which serves the south of Hauts-de-Seine, the north-west of Essonne, Massy-Verrières, via Palaiseau, Orsay, Bures and Gif-sur-Yvette, as far as Saint-Rémy-lès-Chevreuse in Yvelines. This extension of the metro, using part of the existing tracks of the short deleted RER branch, could result in less expensive construction. This extension also makes it possible to respond to the recommendations of the SDRIF to better serve the south of Hauts-de-Seine (Sceaux, Bourg-la-Reine, Fontenay-aux-Roses, le Plessis-Robinson, Châtenay-Malabry) and the north of Essonne to Verrières-le-Buisson, areas experiencing strong demographic development but still poorly served. Finally, this extension of line 4 should allow coherent networking with the T10 tram at Chatenay-Malabry and reduce bus networks, which require more resources and are less efficient. While this project was included in the State-Region Plan Contract (CPER) 2023-2027 for study, local elected officials were not informed of the planned steps regarding this project. Also, he questions him about the next steps planned regarding the extension of line 4.

Machine translation from French. The official text remains authoritative.

Timeline

1. 3 December 2024

   Question

   Source: DateQuestion

2. 11 February 2025

   Réponse

   L'État accompagne le développement et la modernisation des infrastructures de transport collectif en Île-de-France via les contrats de plans État-régions (CPER). Après avoir investi plus de 2,3 Md€ pour le volet « Mobilités et transports collectifs » du CPER Île-de-France sur la période 2015-2022, l'État engage plus de de 2,5 Md€ d'investissements dans le cadre de la nouvelle contractualisation 2023-2027 de ce même volet, formalisé dans un avenant signé le 26 septembre 2024 à l'issue d'une consultation du public menée au cours de l'été. Une enveloppe de 120 M€ a été inscrite dans cette nouvelle contractualisation pour le financement des études des futurs prolongements de métro. Il est prévu que l'autorité organisatrice Île-de-France Mobilités (IDFM) lance une étude générale permettant d'apprécier la faisabilité et le niveau de priorisation des différents prolongements de métro mentionnés dans cet avenant, parmi lesquels figure le projet de prolongement de la ligne 4 à Châtenay Malabry. Les prochaines étapes de ce projet relèvent de la compétence d'IDFM qui détermine les projets d'infrastructures nouvelles, d'extension et d'aménagement de lignes existantes et les approuve. Ces projets font, le cas échéant, l'objet d'un schéma de principe et d'un avant projet.

   Source: DateReponse

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• Jean-Didier Berger · auteur

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