In cities, the city buses provide the smooth movement to the passengers. The movement of city buses are controlled by traffic light system. You, as a software engineer describe the UML, class-based...

In cities, the city buses provide the smooth movement to the passengers. The movement of city buses are controlled by traffic light system. You, as a software engineer describe the UML, class-based modeling for traffic light system and define classes, attributes, and operation to control the city buses movement. The function of traffic light should depend on city buses density therefore reducing long waiting time, if city buses density are very high on specific road.