Emergence and ABM Agent-based models often exhibit emergent properties. One characteristic of an emergent phenomenon is that the system exhibits a property that is not defined at the individual level. For instance, examine the Traffic Basic model (found in the Social Sciences section of the models library). Run the model several times and observe the results. What causes the traffic jams in the model? Does there appear to be any external event that causes them? Inspect the cars. Is there any property of these cars that describes a traffic jam? If one car moves slowly, is that enough to cause traffic jams?