Not quite. I was thinking of a single crossing. At least in the US at many intersections the pedestrian light is synced with the parallel car traffic, which leads to a stream of people blocking right turn traffic due to a constant stream. I am talking about building in a batch iteration, e.g., during the green light, there is a flashing yellow that requires pedestrians to stop for 5 seconds, which would cause pedestrians crossing to group together and creating gaps during which cars can turn.