CCTV and SOS system is the integral part of the Tunnel monitoring and Tunnel Management Systems. PTZ Cameras with night vision quality cameras are used for the portals of the tunnels , and fixed camera with IDS and night vision are used inside the tunnels . CCTV is often integrated with CCTV , and P.A System for effecgive communication inside the tunnels. SOS call stations are installed at every 200mtr , and for P.A System even the acoustic study is also done for better STI and our designs are even with considering the high background noise levels inside the tunnels. SOS call stations used inside the tunnel give high quality audio with the high level background noise of 95dB.
