Impact of Information on Topology-Induced Traffic Oscillations

Previous studies have shown traffic oscillations can be induced by special network topology. In the simplest case, a network of two intersections connected by two parallel roads would produce oscillatory traffic, when the split of drivers between the two roads falls into certain range. To understand how traffic information may affect such oscillations, a subset of drivers is allowed to be reactive in this study; that is, their route choice varies according to information about prevailing traffic conditions on the roads. We show that, depending on the ratio of reactive drivers, the system displays six new decaying, periodic oscillatory, or stable patterns. All solutions are obtained analytically in closed form and validated by macroscopic traffic simulation. Of all the solutions discovered, only one both is stable and fully utilizes the road space between the two intersections, and hence it is more desirable than the other solutions. The findings reveal the link between information provision and topology-induced oscillations, which may help practitioners design strategies that contribute to mitigating the adverse impact of such oscillations.

Automated summary

Previous studies have shown that traffic oscillations can be induced by special network topology, and information about traffic conditions can affect these oscillations. By allowing a subset of drivers to be reactive, the system displays six new patterns depending on the ratio of reactive drivers, with only one stable solution fully utilizing road space between intersections. These findings highlight the link between information provision and topology-induced traffic oscillations, providing insights for designing strategies to mitigate their adverse impact.