Four Phase Intersection Traffic Light Analysis, and Coordination Inside Area of Several Intersections Inside Streets Network in Cities

In this article the authors formulate a graphical decline in the time diagram of a traffic light signal arrangement into a general formula (philosophical basis) that can be used in computer program code for regulating traffic signals at a crossroads, especially in urban road networks. Formula is equipped with an example of numerical calculation. This article can be used and developed more broadly, because it means very basic logic.