Abstract: In order to overcome the difficulties in establishing an accurate data model of mixed traffic flow, a new methed is proposed. This paper mainly takes the single-pointcontrol as the object of study, using industrial control computer and vehicles crossing the detector frontend controller, builds the traffic guidance system. Adjusting period of green time in fixed multi-session and optimization timing plan, the on-line detection of traffic flow at the intersection, which implements the dynamic traffic assignment signal light control.

Key words: intelligent transportation system, signal timing, virtual instruments, LabWindows/CVI