Recently, I eatched traffic at a T-junction in Hyderabad while smoking outside on the stairs. The picture below was very early in the morning when there was little traffic. After 8 AM or so, the atreets were full of cars on all the three sides. The partition on the left only made it to some extent two way traffic on both sides and there were also U-turns. There were no traffic lights or traffic cops but I did not see any accidents during the week I watched. I wondered whether there is some self organizing mechanism at work. Ed Yong has a popular artcle on such phenomena, and I am sure that there are many books and articles studying various aspects of swarms and applications.