Isolated Transit Signal Priority Control Strategy Based on Phase Priority Degree Rule

Abstract:

In order to enrich the key traffic events, which determine signal transition, and balance them to achieve multi objective optimization, the concept of phase priority degree is proposed. Phase priority degree is calculated by key traffic events triggering. Under the dual ring phase structure, the isolated transit signal priority control strategy based on phase priority degree rules is introduced. The logic rules include rules for initial green combination generation, rules for phase transition in barriers and rules for phase transition between barriers. Simulation analysis shows that in comparison with the fixed time control and basic actuated control, the proposed control strategy can reduce delay of transit vehicles efficiently, delay of general vehicles is also reduced to achieve benefit balance among multi objectives; compared to adaptive control based on phase priority degree, the proposed control strategy insures the effectiveness of transit priority.

Key words:traffic control; transit signal priority control strategy; phase priority degree; dual ring phase structure