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In this paper we will build a computer traffic model simulating movement of each individual vehicle through the traffic network and the interactions of that vehicle with other vehicles and semaphores (an agent-based model). It will model a simple traffic network (a two-way coordinated semaphore system a.k.a. "green wave") to test certain hypotheses on different kinds of semaphore systems. We will show that, with certain limitations, such a model can run on an average PC computer at speed up to ten times the real-time. In order to validate this model, a two-way coordinated semaphore system will be statistically compared to a non-coordinated system, hopefully proving the advantage of semaphore coordination.