Optimal traffic light control is a multi-agent decision problem, for which we propose to use reinforcement learning algorithms. Our algorithm learns the expected waiting times of cars for red and green lights at each intersection, and sets the traffic lights to green for the configuration maximizing individual car gains. For testing our adaptive traffic light controllers, we developed the Green Light District simulator. The experimental results show that the adaptive algorithms can strongly

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... ce average waiting times of cars compared to three hand-designed controllers.