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LDA Audio Tech has supplied the public address and voice evacuation systems for three major traffic tunnels in Brazil. These are the Morro Agudo tunnel (1,041 metres) and the Morro do Formigão tunnel (530 metres in main gallery), both in the state of Santa Catarina, and the Morro Alto tunnel (1,841 metres each gallery), located in the state of Rio Grande do Sul.

The Faneque tunnels connect a 2.1-kilometer stretch between the areas of El Risco and Agaete in Gran Canaria (Spain) and are part of a major road infrastructure that connects different population centers along the GC-200 highway.

The Olleria II tunnel (1,001 metres) was built to pass through the Valencian Sierra Grossa located on the Canals - Agullent highway. This is a road with a high traffic flow due to the great industrial activity existing in the regions of La Costera and Valle de Albaida. The tunnel is provided with public address and voice evacuation systems made by LDA Audio Tech.
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