PCD?

All along the newer dual-carriageway section of the A46, from nottingam to Newark are signs saying          "PCD 30m ->"
or various distances, seemingly they are to do with water attenuation ponds, and maybe the associated lifebuoys, e.g.
    <https://goo.gl/maps/2K8hX84ZUw3BAX217
But to anyone just driving along, WTF is "PCD" supposed to mean?
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wrote:

Seen all over the place on new-ish roads, best guess Pollution Control Drainage|dam
Avpx
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The Nomad wrote:

Ah thanks, Dvice apparently, as per
Design manual for roads & bridges, volume4, section2, part3, chapter8
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No idea. Maybe they have not bothered to tell anyone. Brian
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