Decentralized Signal Control for Urban Road Networks
summary
Urban junctions mostly use fixed cycles — about 97% — but simulations with SUMO simulation and comparisons to SCOOT/SCATS show fixed timing limits throughput and yields larger queues; adaptive rules give about a factor-two queue reduction. Longest-queue serving creates network-level oscillations and can be unstable, whereas a proportional-to-queue-length control (max-weight/proportional-fair style allocation) stabilizes the full capacity region in tested networks.
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