Key legal question
Whether the refusal to appoint an independent noise expert violated the right to be heard.
Extracted holding
No. The cantonal court could rely on existing acoustic studies and, after anticipatory assessment of evidence, reasonably deny a new judicial expertise.
Extracted reasoning
The record already contained a detailed acoustic report, supplements, official confirmations, and site inspections. The appellants did not show arbitrariness in the appraisal of this evidence.