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This research aims to develop a simulation of traffic flow at the crossroads, that’s Monjali, Kentungan and Gejayan crossroad in Yogyakarta with and without underpass. The simulation using petri nets and colored petri nets programs. We assumption that each crossroad has the same density, and we look that the traffic flow just went one way. The results of the study show that the queuing system for three traffic intersections can be modeled using petri nets. Furthermore, a queue simulation can be carried out with the help of a colored petri nets program. Simulation results indicate a buildup at certain junctions without underpasses and with underpasses

Traffic Queue System, Mathematical Modeling, Petri Nets Program