French Council of State hears final A69 motorway appeal, rapporteur backs project
France's highest administrative court examined the environmental appeal against the A69 motorway on Monday, as the public rapporteur recommended dismissing the challenge. The case now enters deliberation.
A three-year court battle
France's Council of State held a priority hearing on 15 June 2026 into the cassation appeal brought by environmental associations against the Toulouse–Castres motorway. The appeal challenges a December 2025 ruling by the Toulouse administrative court of appeal, which validated the project's environmental authorisation and allowed work to resume. That decision had overturned a February 2025 judgment by the same city's administrative tribunal, which had annulled the authorisation for lack of an overriding public interest.
The rapporteur's opinion
The public rapporteur urged the court to reject the appeals, arguing that the legally required "overriding reason of public interest" (RIIPM) was met. The magistrate stated that determining such interest did not require an assessment of the number of protected species affected or their conservation status.
The existence of an overriding reason of public interest is assessed without taking into account the number of protected species and their conservation status.
The rapporteur added that the public interest must be weighed against species conservation, and that the project would deliver substantial gains in comfort, punctuality, safety, and travel time for the Castres-Mazamet area. Local elected bodies overwhelmingly support the motorway, the court was told.
Environmental concerns
The 50‑kilometre A69 link would encroach on agricultural land and harm 157 animal species according to opponents, who include France Nature Environnement, Friends of the Earth, and L'Affaire du siècle. An environmental authority opinion from 2022 described the scheme as "anachronistic" given current sustainability goals, but the rapporteur argued the RIIPM is a legal criterion and the administrative judge is not meant to arbitrate political choices.
Construction presses ahead
Despite the legal uncertainty, the concessionaire Atosca reports that work is on schedule. It plans to open the section between Castres and Verfeil in mid‑October 2026. Atosca told reporters that all earthworks and engineering structures are finished, and that 25 km of roadway have already received their final asphalt layers.
All earthworks are complete, all engineering structures built, and 25 km of roadway have received their final asphalt layers.
What happens next
The Council of State has reserved its decision after the hearing. No date has been given for the ruling. The project's fate therefore remains in the balance, with both sides awaiting the outcome of a case that will set a benchmark for weighing infrastructure development against biodiversity protection in France.
- Toulouse administrative tribunal annuls environmental authorisations for the A69 motorway.
- Toulouse administrative court of appeal validates the authorisations and authorises work to resume.
- Council of State hears cassation appeal; public rapporteur recommends rejecting the environmental challenge.
- Atosca plans to open the Castres–Verfeil section of the A69.
