We know how. The Niayesh tunnel project is the largest on- going civil engineering project in Iran. Tehran›s urban tunnel, 10,252 m long, is the second longest tunnel in Asia for auto traffic, after the Baotashan urban tunnel in China which is 10,480 m long. Built in the shortest time Two main traffic arteries on multiple levels including ramps and loops were built in Tehran. When the entire project is finished, the traffic situation in th

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