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October 26, 2019 03:30 am

Why Ants Are Practically Immune To Traffic Jams

ScienceAlert reports on a new study published in the journal eLife that explains for the first time how ants are immune to traffic jams, even under crowded conditions. From the report: By cooperating in a self-organized system, researchers have found that Argentine ants (Linepithema humile) can adapt to different road conditions and prevent clogging from ever occurring. All it takes is a little selflessness and restraint - something we humans should maybe consider. Filming 170 repeat experiments, researchers observed how this particular species of ant moved along a bridge between their nest and a food source. The experiments included different widths of bridge (5 mm, 10 mm, and 20 mm), holding anywhere between 400 and 25,600 ants. Throughout the process, data was collected on traffic flow, the speed of the ants, and the number of collisions that occurred. What the authors found was surprising: these ants appeared to be immune to traffic jams. "The exact nature of the mechanisms used by Argentine ants to keep the traffic flowing in this study remains elusive," they write, "yet when density on the trail increases, ants seemed to be able to assess crowding locally, and adjusted their speed accordingly to avoid any interruption of traffic flow." In fact, compared to humans, these ants could load up the bridge with twice the capacity without slowing down. When humans are walking or driving, the flow of traffic usually begins to slow when occupancy reaches 40 percent. Argentine ants, on the other hand, show no signs of slowing, even when the bridge occupancy reached 80 percent. And they do this through self-imposed speed regulation. When it's moderately busy, for instance, the authors found the ants actually speed up, accelerating until a maximum flow or capacity is reached. Whereas, when a trail is overcrowded, the ants restrained themselves and avoided joining until things thinned out. Plus, at high density times like this, the ants were found to change their behavior and slow down to avoid more time-wasting collisions.

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