The decision to construct an immersed tube tunnel bypass followed an extensive public consultation which ruled out another bridge by the castle on aesthetic ground since it would have damaged the view of the world heritage site Conwy Castle and the two bridges by Robert Stephenson and Thomas Telford.
The decision to construct an immersed tube tunnel bypass followed an extensive public consultation, named the Collcon Feasibility Study. This ruled out another bridge by the castle on aesthetic grounds, since it would have damaged the view of the world heritage site Conwy Castle, and the two bridges by Robert Stephenson and Thomas Telford.