Niayesh Tunnel

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The Niayesh Tunnel Project is a road traffic tunnel in the north of Tehran, Iran.^[1] The Niayesh tunnel has two parallel roads that are within 130 m (430 ft) of each other for most of the route. Traffic in the north tunnel flows from east to west. In the south tunnel it flows from west to east.

For the first time in Iran, there are some embranchments of other tunnels among main tunnels. Among the north tunnel, Kordestan tunnel with a length of 950 m (3,120 ft) – the same length as the Resalat tunnel – is branched from the north tunnel that it makes accessible to downtown and Hemmat highway through a connection between the north tunnel and Kordestan Highway. Also, the north Kordestan highway would be connected to the south tunnel through a 194-metre (636 ft) tunnel that provides traffic flow to east Tehran. The total length of the main tunnels as the second longest urban tunnel in the world excluding ramps is 6,658 metres (21,844 ft). The total length of the main tunnels and access tunnels, including ramps, is 10,252 metres (33,635 ft).