Abstract: Among Intersection signal control in urban areas,thePhasing-Sequence design has a very close relationship with the traffic flow path through the intersection.Without changing the phase combination of circumstances,a reasonable Phasing-Sequence can greatly enhance the efficiency of intersections.By analyzing the conflict point of traffic tracks in intersection and ensuring the safe passage of vehicles to pursuit the maximum of green signal ratio,this paper establishes a Phasing-Sequence optimization model.Taking the intersection of Guangzhou as an example,the Phasing-Sequence optimization resultedin an upgrade of efficiency of 13.4%.

Key words: traffic engineering, phasing-sequence optimization, traffic trajectory, conflict points, green signal ratio