Heatherwick's Rolling Bridge. 2:14 video:
I like this rolling bridge model:
Extendible bridge on truck bed - GIF
World's heaviest lift bridge - photo and video
Ponte Morandi bridge demolition - GIF
Lego bridge girder machine - GIF
Train collapsing bridge silent cinema scene - GIF
Issues other than "why"
if you walk up to it when it's closed, it opens towards you. People don't like things opening towards them, causes them to step on the toes of the person behind them.
You could lock someone in there.
It would be more fun if you got in and rolled it across like a hamster wheel.
The bridge straddles a "waterway" that's only inches deep - the ducks are standing up in it - so said waterway must be purely decorative; no watercraft are going to be passing through it.
So, that raises the question, why does the bridge need to be retractable? A decorative stationary pedestrian bridge would be satisfactory and, done well, would fit into the architectural scheme.
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