Questão jurídica principal
Whether the roundabout and road relocation had to be treated as new fixed installations under the noise ordinance.
Decisão extraída
The roundabout was a substantially modified installation, not a new one; the road relocation also did not amount to a new installation.
Fundamentação extraída
Functionally, the project still served the same traffic flow between the cantonal road and Route des Tuileries. The change did not make the remaining elements secondary, and it was not a transformation of a quiet installation into a noisy one. The existing traffic situation was even likely to become less noisy.