Conseil d’État definitively confirms construction of the A69 motorway between Toulouse and Castres

Toulouse – 29.06.2026: On Monday, 29 June 2026, the Conseil d’Etat definitively confirmed the environmental permits for the planned A69 motorway between Toulouse and Castres and dismissed the cassation appeals filed by several environmental organisations. This renders the decision of the Cour administrative d’appel de Toulouse of 30 December 2025 final, allowing the project to proceed.

In its written reasoning, the highest administrative court cites the existence of an overriding public interest. Mentioned reasons include time savings on the Toulouse–Castres connection, an expected improvement in road safety and boosts to the economic development of the Castres and Mazamet conurbation. In the rulings under case number n°512448 and following, the Conseil d’Etat regarded the national approval steps as lawful.

Associations such as France Nature Environnement Occitanie, Amis de la Terre Midi-Pyrénées and Notre Affaire à Tous had been taking legal action against the permits since 2023. They mainly criticise impacts on wetlands and agricultural land, tree felling and possible effects on aquifers. After their defeat, representatives of the initiatives announced they would review the filing of a complaint with the European Commission. Such a procedure could be based on EU environmental law and species protection rules, but it does not immediately affect the continuation of works.

The A69 is planned as a roughly 53-kilometre new-build route between the Verfeil/Castelmaurou area northeast of Toulouse and Castres. The concession company Atosca is the project owner; key permits were issued in 2023 by the responsible prefectures. Since then the project has undergone a series of judicial stages in which certain decisions were upheld or annulled, before the Conseil d’Etat now established the legal line. Construction had already largely begun, including tree clearance, earthworks and bridge foundations.

Supporters from politics and business point to the chronic overload of the existing RN126, the number of accidents on rural roads and the improved connection of the Castres-Mazamet industrial and healthcare hub. Opponents counter that additional roads will attract more traffic in the long term, increase land consumption and jeopardise emissions reduction goals. They demand alternatives such as upgrading existing routes, speed reductions, improved bus and rail services and stricter compensatory measures for natural areas.

With the decision of 29 June 2026, the national procedure is effectively closed. It remains open whether an EU complaint will be accepted and whether it could lead to a formal infringement procedure. Until then, the permits remain in force, and the project timetable is the responsibility of the concessionaire and the competent authorities.