This Article deals with traffic light management in cities. Our solution is based on a sensor network, which should provide enough information for dynamic methods. This solution is about the implementation of genetic algorithms into the system of traffic light control systems to make it more efficient. The article provides a simulation tool for dynamic and static traffic light management simulation, based on multi-agent system and discrete event simulation algorithms. The results of the simulation, provided in this article, should prove the benefits of our dynamic solution for city traffic, which has an indisputable impact on the living standard of citizens in cities.