A novel fuzzy method to traffic light control based on unidirectional selective cellular automata for urban traffic

Vehicular travel which demands on the concurrent operations and parallel activities is increasing throughout the world. In this paper to control urban traffic, we study the optimization of traffic light controller in a city and present a fuzzy algorithm based on cellular automata. In existent system factors like priority of streets of intersection and width/length of streets are assumed equal. However, in real situations parameters like time during the day, density of vehicles of street and number of shopping centers have determinant effects on amount of traffic of streets. To overcome such limitations we propose a three leveled fuzzy system. At first level priority of street is computed based on fuzzy rules. At second level real velocity of vehicles is calculated. We use CA for simulating vehicles´ density transmission. At third level by regarding priority of street and amount of density, decision for changing status of traffic light is done.