Voice evacuation system installed in a tunnel facility allows conveying messages to travellers. In a fire hazard or other emergency, it allows to carry out the evacuation and direct travellers to safe locations immediately. The most effective and most efficient system is the voice evacuation system, which provides clear and understandable transmission of voice messages from the beginning of their broadcasting.
As a result, in an emergency, passengers in tunnel can quickly and efficiently respond to commands of evacuation services. Transmission of voice should be as clear as possible. In tunnels, due to the long reverberation time and the high level of prevailing noise, it is very difficult to meet this condition.