And when I was in Prague (I think) they had on all crossings pedestrian green light for like 5-10 seconds top, specifically to use this rule about starting cros

And when I was in Prague (I think) they had on all crossings pedestrian green light for like 5-10 seconds top, specifically to use this rule about starting crossing on green. I assume the idea was to make pedestrians cross in groups, not in continuous flow.