In this research it will be accomplished the supervision of valid passenger car unit values, which are applied in effective road technical specifications. It was used VISSIM micro simulation program made by PTV Ag. It has been examined four different types of junctions (T-intersections, 4-leg intersections, signalized intersections, roundabouts).Simulation running have been completed to the different types of junctions with different types of vehicles, random factors and volume of traffic from which it could be defined those PCU values, which indicate current traffic situations. They have been compared to values applied at the moment and I propose PCU values for capacity calculations.
In the junction capacity calculation methods the passenger car unit has a very important effect, because heavy vehicle traffic flow can only be counted with passenger car unit. Since not the proper passenger car unit values are used in the current practice, the results of junction capacity calculations cannot be regarded as correct, either. This research is focused on finding an answer as to whether the results are more precise if models with three junctions are examined rather than models with one junction.