Video of driving through the Conwy Tunnel.
Here is a a video of the Conwy Tunnel. I took this video on the 5th of March 2010. It is of driving through the Conwy Tunnel. The tunnel is on the A55. The tunnel is just by Conwy Town.
The crossing of the estuary of the River Conwy is by means of an immersed tube tunnel that was constructed, by a Costain / Tarmac Construction joint venture, as pre-formed concrete sections and then floated into position over a pre-prepared trench in the bed of the estuary. An immersed tube is a kind of underwater tunnel composed of segments, constructed elsewhere and floated to the tunnel site to be sunk into place and then linked together. They are commonly used for road and rail crossings of rivers, estuaries and sea channels / harbours.
The A55, also known as the North Wales Expressway, is a major road in Britain. Its entire length is a dual carriageway primary route, with the exception of the point where it crosses the Britannia Bridge over the Menai Straits. The road originally ran from Chester to Bangor but was extended parallel to the A5 across Anglesey right into Holyhead Docks in 2001.