 At each corner of the square is the terminal of an exit ramp from one main road and an entrance ramp to the other main road.Traffic transferring from one road to the other to make an overall right turn only passes through one corner of the square, at which point a right turn is made.Transfer traffic making an overall left turn must proceed straight through the first intersection it encounters, turn left at the next, and then proceed straight through a third intersection to enter the other main roadway.