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We provide a Public Address system developed for the environment and structure of tunnels for road, rail and metro. The Vingtor-Stentofon solution for tunnels offers a complete system including all stages of critical communication between tunnel users and emergency services. We offer operational panels for the Traffic Management Centers, Public Address inside tunnel tubes, evacuation tunnels and rooms, and Radio communication and fire call panels for use both inside and outside the tunnel.
The EU directive, 2004/54/EC on minimum safety requirements for road tunnels over 500 meter states that there shall a Public Address system present in shelters and exits for all road tunnels, as well as an Emergency Telephone per 150 meter (250 meter is allowed for existing tunnels). However, companies like VINGTOR-STENTOFON have finally made intelligibility possible for Public Address / Voice Evacuation also in the main tunnel pipes. Countries like Germany, United Kingdom, Holland and Austria has been in forefront of going beyond the minimum requirements. More countries are added to this list every year as they see that, especially the powerful combination of CCTV and Public Address can strengthen the self-rescue principle in case of fire.
The principle of self-rescue means that the public have to evacuate by own power in emergency situations. All road users shall have knowledge to the self-rescue principle, while it lays an extra responsibility with the road owners to make the principle acknowledged. The precondition for the self-rescue principle to work in practice is that all tunnels are designed and equipped with technical installations that will give the needed effect in an emergency situation.
In a tunnel, the Public Address system is the ONLY way of communicating with the passengers once they are outside their vehicles. People respond to human voice because we are trained for it. Independently addressable loudspeakers can give even more accurate and situation-specific, guidance or reassurance. If the situation is less critical, simple reassurance of being safe while feeling trapped in a tunnel can reduce potential trauma and long-term human effects.
Studies have also shown that people are reluctant to leave the perceived safety of the car during the first critical minutes of an incident. As there is still some doubt regarding the future coverage, usage and functionality of DAB car radios, high sound pressure Public Address can therefore be a valuable addition.
Coming from Norway, a land with 1000 road tunnels with a combined length of 800 km, VINGTOR-STENTOFON has 45 years of Public Address experience and has specialized in Emergency Phones since 1945. Today our portfolio is focused on state-of-the art VoIP solutions.
Doing Public Address inside what is basically a concrete tube is about as challenging as it gets due the reverberation time and other acoustical challenges. Getting to Speech Transmission Index (STI) levels of 0,45 throughout the tunnel is in fact sometimes an achievement. We can achieve the necessary intelligibility, most often measured by the STIPA method, by having specialized tunnel solutions. Some tricks of our trade are using specialized, highly directive and powerful tunnel loudspeakers that are time-delayed and equalized according to the tunnels acoustical properties. Taking care of redundancy in case of fire as well as full monitoring of each system component, all connected back to the road traffic control center over IP is part of our core competence in numerous industries.
Our systems supports open integration standards like: SIP, SNMP, SMPT, NTP, Syslog, G.722 and more.