Case Study RFI provided a communications solution to deliver Break-In Emergency Services radio coverage and AM/FM rebroadcast (RRB) system as part of the $550 million Sydney Hills M2 tunnel upgrade. An audio break-in capability allows pre-recorded or live audio announcements to be inserted into the AM and FM rebroadcasts so drivers can hear them on their car radios. To reduce traffic congestion and improve travel time, Transurban undertook a significant upgrade of Sydney’s M2 Motorway, which included widening the 360m roadway tunnel from two to three lanes in both directions. During this process, Transurban recognised the need to upgrade the public address system and audio break-in of the AM/FM Radio Rebroadcast System (RRB) via the Intelligent Transport System (ITS). Trans

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