English: Sea defences The route of the A55 'Col-Con' Expressway was severely constrained by the coastal topography and built environment. Here the road passes through the site of a large coastal quarry and considerable engineering was required to create and defend the new formation. Cast-concrete anchor blocks interlock to provide a primary energy-dispersive barrier, with conventional rock-armour to stabilise the upper slope. Very geometric, but very dangerous because the structure includes large voids into which anything can drop easily.
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