The report represents the method and results of research for basic characteristicsof stream  traffic in signalized intersection in condition of urban traffic with many two - wheel vehicles. By experimental method, collection direct the traffic on the leg approaches saturated, near saturated and unsaturation,  the statistic is used to treat the data.  The results are base  to define the change  traffic flow, caculation capacity and staet of traffic flow .
Key word: Signalized intersection, Capacity, saturation flow , leg approach ( lane groups) volume of traffic, green time.