Viewing the video indicates failure being initiated by a hinge forming in the top slab at its node with the inclined member. This, in turn, suggests that the end reaction of the deck weight was being transferred through the stub tower to its connection with the top slab - causing that member to act as a cantilever (something I doubt was intended by the designers). This could only occur if the connection between the bottom slab and the foot of the stub tower was insufficient to generate truss action.
Comment on: Stockport's newest bridge lifted into place
Please note that this is NOT a Vierendeel truss. It is a Warren truss.
Comment on: Engineers told to name the projects that matter
Mr Pratt is mistaken in his belief that our highway network should be frozen for the present. Effective transport is a must for a buoyant economy. Electric vehicles require efficient roadways just as much as those powered by oil burning engines. It remains true that highways can be accommodated much more simply (and cheaply) into our compact terrain than rail. They are very much more tolerant of the difficult geometrical constraints within our cramped island.
The emphasis on the need for fresh energy generation is absolutely right. Rapid decisions are needed regarding Nuclear Power sites.