Switzerland is confirming it has heard nothing from the French authorities about the impact of a proposed new autoroute running from Thonon to Annemasse.
Under international agreements, countries are compelled to consider the impact of infrastructure projects on neighbouring states.
Switzerland is concerned the new road will increase pollution and noise and is now largely unneeded due to the opening of the cross-border train service, Léman Express.
Despite no information from Paris, a tender has been published looking for bids from companies to start building.
Bern plans to raise the issue with Paris again.
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