Published Jan 20, 2011
You're in a rush to class because you're late. The traffic light is green and there is a car coming.
You cross the street anyway, making it necessary for the driver to come to a stop. You are followed by a posse of other students who cross the street at their leisure, stopping even more traffic.
By the time the initial group has crossed the street, the light is red, and the flow of students keeps on coming. When the light is green and traffic is moving again, someone else starts the cycle.