Modeling Signalized Traffic Intersections Using SAS Simulation Studio

In this paper we show how SAS Simulation Studio can be used to model various traffic light junctions. A traffic light is modeled using a Server Block together with a Flow Control Block. The Server Block is used to generate the cycle length of the traffic signal while the Flow Control Block regulates the red and green phases. Each traffic light junction is then modeled as a queuing system where vehicles arrive at the traffic light during a red or green phase. We assume a vehicle arrives at random but the time it takes to pass the junction will depend on its arrival status, for example, a vehicle arriving and stopping during a red phase with a queue in front will take a longer time to pass the junction than one arriving during a green phase with no queue ahead. This presents a more realistic picture of the simulation