It guarantees no cross traffic. Turns are still a threat. I’ve seen the type of light you describe (all pedestrians walk in all directions at once while all ca

It guarantees no cross traffic. Turns are still a threat. I’ve seen the type of light you describe (all pedestrians walk in all directions at once while all cars have a red) in the US but they’re exceedingly rare. In cities there’s always pedestrians and cars waiting in every direction so it would be too slow to be practical.