Capacity-aware back-pressure traffic signal control
Résumé
The control of a network of signalized intersections is considered. A queuing network with exogenous arrivals is used for modelling. Previous works demonstrate that the so-called back-pressure control provides stability guarantees under infinite queues capacities. In this paper, we highlight the failing of state-of-the-art back-pressure control under finite capacities by identifying sources of non work-conservation and congestion propagation. We propose the use of a normalized pressure which guarantees work-conservation and mitigates congestion propagation while ensuring fairness at low traffic density and recovering original back-pressure as capacities grow to infinity. This capacity-aware back-pressure control enables to handle higher arrival rates, as indicated by simulation results, and keeps the key benefits of back-pressure: ability to be distributed over intersections and O(1) complexity.
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