Dublin Port Tunnel The €752m Dublin Port Tunnel opened to traffic on December 2006. Spanning 5.6 km of motorway and acting as a link between Dublin Port and the national motorway network, Dublin Port Tunnel is the largest ever civil engineering project in Ireland. Featuring a twin bore tunnel of 4.5km in length and with a height clearance of 4.65m, the tunnel is one of the largest urban tunnels of its kind in Europe. Security requirements..

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