[mertd]

> Interestingly the ferry which is currently used to transport trucks is only at roughly half capacity.

Sometimes the existing solution doesn't need to be bursting at the seams to justify building something better. A better solution can induce its own demand.

[ed_balls]

Yes I imagine most of the traffic goes through the bridge in Denmark. What is more, that bridge is a single point of failure, which is a problem in case of an accident or maintenance.