"T" - for Tunnel Communications

"T" - for Tunnel Communications

TRAFSYS won the contract to deliver an innovative communication solution for the large "T-Connection" road construction project in Norway. This includes a radio system and emergency roadside telephones.

Radio and Emergency Roadside Telephones

The radio system offers VHF, FM, DAB and UHF (TETRA) radio coverage, which is achieved by installing a Leaky Feeder cable inside the tunnels. For the local VHF rescue channels there are also antennas by each entrance port, to secure coverage outside the tunnels. There are signal amplifiers (repeaters) installed throughout the tunnel (max distance of 1500 meters), and receivers and transceivers are installed to achieve the best coverage seen in connection with the topographical environment.

Car radios can receive signals from the Norwegian FM-stations “NRK 1", “P4" and “Radio Norge", in addition to the DAB channels “Riks" and “Local Rogaland". If an emergency situation should occur, operators at the Traffic Management Centre (Veitrafikksentralen VTS) can take control of the radio to give essential information to people inside the tunnel. This can be achieved by using the microphone located outside the tunnel, or by dialling a telephone number associated with the emergency network. The radio system from TRAFSYS also have own channels for ambulance, police and fire services, so that the emergency services easily can communicate with each other.

TRAFSYS have also delivered Norphonic emergency roadside telephones (ERT) to the T-connection tunnels. If a Norphonic telephone handset is lifted, the conversation will be automatically connected to the Traffic Management Centre, which automatically will be informed about the exact location the call is coming from. All the emergency telephones are redundant, which means that the telephones will still work if one network cable or other telephones goes down. The Norphonic telephones also provide advanced information about their individual components, and can be monitored and upgraded from a remote location.

Video Surveillance, LED Signals and Data Network from TRAFSYS

TRAFSYS have also delivered a video surveillance system which automatically warns the Traffic Management Centre about wrong-way drivers, queue tail build up, lost cargo or people walking inside the tunnel. In addition, TRAFSYS have also installed the LED signals inside the tunnel, which can be used to inform about tunnel closures etc.

TRAFSYS also delivered the overall IP data network, which is used by all the intelligent traffic systems inside the tunnel. This network consists of a fibre network with high capacity routers. The system is also redundant (use dynamic OSPF routing) and is dimensioned to handle large amounts of data – including video footage from the cameras. There are also 10 redundant sub-nets controlled by using rapid spanning tree protocol (RSTP) inside the tunnel. All the data from the network can be controlled and monitored remotely by the Traffic Management Centre.

Intelligent Traffic Management

All the individual ITS systems in the T-Connection is connected to the overall traffic management system PREVISION. This is an intelligent management system that is designed to manage environment and safety within road tunnels. PREVISION can be used to control telephones, LED signals, radio systems and video surveillance solutions. The PREVISION system also provide the operator with information frompre-made emergency plans, which is very beneficial in emergency situations such as tunnel fire or car breakdowns.

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