[Chattered]

I see this frequently in Edinburgh. I join a group at the pelican crossing and after waiting too long, realise that the button hasn't been pressed.

Many of our crossings do nothing if you don't press the button. And if the light has been green for road traffic for a while, pressing the button /immediately/ sets the traffic sequence towards red. I often let the odd car pass so the traffic looks clear before pressing, rather than force a poor driver to a stop.