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Countdown comes before red man. After 5s of red it's always green traffic. Or have I misunderstood you?
The pedestrian crossing on Oxford Street just opposite TCR tube station counts down to 0 then immediately the traffic lights turn green. This causes plenty of issues as the road is generally half full of pedestrians as soon as the lights turn green, and plenty of people - cyclists and drivers alike - all head forwards regardless.
Countdown pedestrian crossing signals. I'm pretty sceptical of them as a ped. I tend to now start crossing the road with 5 secs to go showing, when I wouldn't have started after 5 secs of a red man. I think.