I have thought of an Innovative Way that a Metro Bridge from North to South Shields could work.

I think that it could work one way and is to put Sensors across the Central Section of the Potential Bridge, Sensors would also be put onto the DFDS Ferrys and other Ships, this would then send a "Message" to the Bridge Controller. Who would then press a Button or something, and then the Bridge would Retract like a Football Stadium Roof to then allow the Ferry Through.

Obviously this would have a affect on the Metro as it would have to be timed to perfection to allow enough time for the Ferry/Ships to get through, similar to that of the Holy Island Crossing, other signals would have to be sent to turn the metro signals from Red to Green and so on.