The City of Geneva is stepping up its fight against the planned A412 autoroute between Machilly and Thonon in neighbouring France.
Backed by a critical environmental report from the French National Council for Nature Protection, officials warn the project could cause serious damage to biodiversity.
The city will now join a cross-border consultation under the UN Espoo Convention and is preparing legal action in France.
Mayor Alfonso Gomez says the autoroute risks increasing traffic, pollution and noise - running counter to climate goals.
An appeal to France’s highest administrative court is also being considered.
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