Mark-III AM & FM
Rebroadcast System has been an integral part of the development
of (ITS) Intelligent Transportation Systems for
The primary users of highway
tunnels are passenger vehicles, whose standard
informational platform is a commercial car radio.
AM & FM Rebroadcast in highway tunnels encourages
drivers to keep their radios active.
The use of an Mark-III AM & FM Rebroadcast
System when combined with the emergency override
option, allows a locally produced message to substitute
all of the normal broadcast signals, and creates
a critical access to all of the active car radios
in the tunnel.
Emergency override messages may be as simple as lane closures announcements or as critical as communications during tunnel emergencies such as emergency bore closures and tunnel fires. The emergency override gives the operating agency the ability to communicate with the primary users of the tunnel and complement other ITS elements like variable message signs (VMS) into a more effective traffic management system.
Highway Advisory Radio (HAR)
can be included as an incremental channel on the
Mark-III AM & FM Rebroadcast System, to make that channel
available within the tunnel to compliment and enhance
the adjacent over the air HAR system. AM & FM
plus HAR Rebroadcast significantly enhances traffic
management and safety in Highway Tunnels.