Tohid Tunnel is in Tehran Capital of Iran
The rapid growth of city of Tehran in recent decades has caused daily heavy traffic jam, big wasting of energy, expenses and time and finally, air pollution. Tohid Tunnel with six lane round trip traffic and 2136 metres length is the longest intercity traffic tunnel in Iran.
Since 2009, after construction of Tohid Tunnel in Chamran north-south expressway, traffic jam has moved freely and furthermore, huge changes have been made in the surrounding area of the project.
The equipment used in Tohid Tunnel is of the best hi-tech and engineering equipment, among others, 70 jet fans and 12 axial
fans to ventilate the Tunnel by driving out the exhaust air, and letting in the fresh air, and special and standby generators anticipated so that if there is a power cut in Tehran Grid Power, those generators will automatically generate the power to compensate the required power of the Tunnel.
