In article ,
Paul Scott wrote:

Latest DfT standard design, following on from Zebra, Pelican, we now have
'Puffin', and although recent, they aren't exactly new. They include
pedestrian detection. Once the pedestrians are clear of the crossing, the
road traffic lights change, so the flashing amber phase isn't needed.

Cambridge is full of the bloody things. The "once pedestrians are
clear bit" appears to be an entirely theoretical aspect of their
design.