Intelligent Coordination among Multiple Traffic Intersections Using Multi-Agent Reinforcement Learning
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We use Asynchronous Advantage Actor Critic (A3C) for implementing an AI agent in the controllers that optimize flow of traffic across a single intersection and then extend it to multiple intersections by considering a multi-agent setting. We explore three different methodologies to address the multi-agent problem - (1) use of asynchronous property of A3C to control multiple intersections using a single agent (2) utilise self/competitive play among independent agents across multiple intersections and (3) ingest a global reward function among agents to introduce cooperative behavior between intersections. We observe that (1) (2) leads to a reduction in traffic congestion. Additionally the use of (3) with (1) (2) led to a further reduction in congestion.
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