Abstract
We compare three routing models incorporating different information about the network state, showing that local congestion awareness improves the resilience to congestion emergence more than a decentralized dissemination mechanism, which uses dynamically sourced and disseminated information. Before the emergence of congestion, local information is optimal, because it induces the smallest deviation from the shortest path, allowing at the same time to avoid localized congested. When congestion becomes unavoidable, the analysis of the fundamental diagram showed that dynamically sourced information is able to maintain the traffic flow more fluid for a period. With regard to congestion emergence, we found a transition from instability to stability, controlled by the memory parameter. Interestingly, this transition corresponds to a transition for the density field from a very heterogeneous configuration to a temporally and spatially uniform one, that approximates well the Wardrop equilibrium for the system. Finally, our results are in agreement with previous work on the role of traffic spatial and temporal heterogeneity and suggest a two-fold strategy for dealing with congested networks.
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