Tunnel får 200 høyttalere, 200 kameraer og 18 bommer
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Mælefjelltunnelen blir landets første tunnel der Vegtrafikksentralen kan snakke direkte til trafikantene hvis det brenner - Tu.no
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Clear Announcements for Motorists: New Chances for safe Voice Alarms in Tunnels - tunnel
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Clear Announcements for Motorists: New Chances for safe Voice Alarms in Tunnels - tunnel
PA/VA systems for tunnels - LDA Audio Tech
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